Geometry Videos: 2015

Wednesday, July 1, 2015

Finding the perimeter of a rectangle-Geometry Help

This video gives direction for finding the perimeter of a rectangle when only one side is given. The diagonal of a rectangle creates a right triangle that can be used to find the missing side.

Common Core Standard G-GPE.7

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Monday, May 18, 2015

Angle side angle proof-Geometry Help-MooMooMath

How to use angle side angle "ASA" in order to prove two triangles are congruent.

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Sunday, May 17, 2015

How to set up trig ratios-Geometry Help-MooMooMath

How to set up trig ratios with a right triangle.
The video demonstrates how to set up a trig function in order to find missing length and angles of a right triangle.
Follow these steps to set up trig functions properly.
The first step is to find the reference angle.
Next, label the opposite,adjacent,hypotenuse sides of the right triangle.
Finally, decide which trig function to use and then set it up.
The trig functions used in this video are:
Sine=Opposite over hypotenuse
Cosine=Adjacent over hypotenuse
Tangent= Opposite over adjacent

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Saturday, May 16, 2015

Adding, Subtracting :Functions

How to add and subtract functions.

0:06 Introduction to adding and subtracting functions
0:03 Problem 1,add g(x) +j(x)
1:21 Solution to problem 1 (Adding functions)
1:36 Problem 2 Subtract functions j(x) -g(x)
3:07 Solution to problem 2

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Finding radius circle from arc length-Geometry Help-MooMooMath

Finding the radius of a circle from arc length.

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Thursday, May 14, 2015

Simplifying Complex Fractions-Keep, Change, Flip

How to simplify complex fractions
Complex fractions have a fraction on top of a fraction
Video Guide
0:46 Simplify 5+7/11 / 5/12
0:51 Simplify the numerator of the complex fraction =12/11
0:58 Don't simplify the denominator but move the fraction over so the complex fraction becomes 12/11 divided by 5/12
1:35 Change the problem from division to multiplication by Keeping the first fraction the same, changing the sign,flipping the last fraction
2:22 Answer to first simplifying complex fractions problem
2:39 Problem 2 Simplify the complex fraction 3/4 + 2/3 /1/2
2:54 Simplify the numerator of the complex fraction by finding a common denominator
3:51 After simplifying the numerator you get 17/12 divided by1/2
4:06 Apply Keep in Change it Flip it
4:42 Answer to problem 2
5:05 Simplify the complex fraction that contains variables
1/2 + 1/x /x^2 + 2x
5:12 Simplify the numerator by finding a common denominator
6:23 Use the keep it Change it Flip it rules to turn the problem from division to multiplication
7:30 Final answer "Simplify a complex fraction with variables"

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Wednesday, May 13, 2015

Convex and Concave Quadrilateral-Geometry Help-MooMooMath

Concave and convex quadrilaterals-- Geometry Help-MooMooMath

Most quadrilaterals are convex quadrilaterals because each interior angle is 180 degrees or less. Common examples are kites,squares,and rectangles.

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Tuesday, May 5, 2015

Shortcuts for finding the leg lengths of a 30-60-90 triangle-Geometry Help

Use these shortcuts to help find leg lengths and the hypotenuse of a 30-60-90 triangle.
For example,if you are given the leg length how can you quickly find the hypotenuse?
If you are given the hypotenuse of a 30 60 90 triangle,how do you find the leg length?

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Wednesday, April 29, 2015

Angles in a parallelogram-Geometry Help-MooMooMath

Hi welcome to MooMooMath Today we are going to look at angles in a parallelogram
First we need to know, “ what is a parallelogram?”
A parallelogram is Quadrilateral meaning a polygon with four sides with the opposite sides parallel. We have the top parallel to the bottom (BC is parallel to AD) and (AB is parallel to DC)
This is one property that defines a parallelogram. Another property of a parallelogram is that opposite angles are congruent to each other.
Angle B will be the same measure as angle D
Let's give the angle B a measure equal to 120 degrees. Because angle D is opposite angle B it will also have an angle measure of 120 degrees. Now A and C are congruent ,but they have to have a relationship to D and B and the relationship is that these two consecutive angles are supplementary ,which means they add to 180 degrees. If angle D is 120 degrees then angle A has to be 60 degrees and angle C has to be 60 degrees. Any pair of consecutive angles of a parallelogram are supplementary.
Also, the opposite angles are congruent. Let's try a practice problem. Let's change these numbers and angle C will equal to 80 degrees. We can figure out the other three angles. What do we know about angle A ? Angle A would have to be 80 degrees and angles D and B will have to be supplementary angles to 80, so each angle would be 100 degrees. Remember, opposite angles of a parallelogram are congruent, and adjacent angles are supplementary. Hope this video was helpful on angles of a parallelogram.

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Sunday, April 26, 2015

Slope of a Line-Geometry Help-MooMooMath

The slope of a line is a measure of how the line angles away from the horizon and uses the formula rise over run. Video explains how to find the slope of a line and examples.

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Related sites

Finding the slope of a line
http://www.coolmath.com/algebra/08-lines/06-finding-slope-line-given-two-points-01

How to find the slope of a line
https://www.youtube.com/watch?v=LR1cpFYCGdU

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Saturday, April 25, 2015

Area of an Equilateral Triangle-Geometry Help-MooMooMath

How to find the area of an equilateral triangle.
The formula for the area of an equilateral triangle equals
1/2 base * height.

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Friday, April 24, 2015

Volume of a Cone or Pyramid-Geometry Help-MooMooMath

How to find the volume of a cone and a pyramid

Example problems involving finding volume.
The formula for volume for both a cone and a pyramid equals 1/3Base times height

Example 1 = Find the volume of a cone with a slant height of 13 and a radius of 5 units.

Example 2= Find the volume of a pyramid with a square base with sides of 10 units and a slant height of 13 units.

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Thursday, April 23, 2015

Trigonometry-Word Probems-Finding Angles using Sine-MooMooMath

Trigonometry Application Problems-Using Sine

This is a short trigonometry problem that uses the trig function sine in order to solve an application problem.The application problem is asking for an angle measure of a right triangle.

A skateboard ramp is 6 feet long and three feet high,what is the angle of elevation?

Step 1. Draw a picture. When you draw the picture you notice the ramp forms a right triangle.

Step2. See which sides of the right triangle you have. In this problem you have opposite and hypotenuse.

Step3. When you are finding angle you will use the inverse function of sine I call these backward problem

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Wednesday, April 22, 2015

Finding the surface area of a sphere-Geometry Help-MooMooMath

Simple directions for finding surface area and volume of spheres.The surface area of a sphere is the total area of the curved surface. The volume of a sphere is the amount of space enclosed by the sphere.

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Tuesday, April 21, 2015

Pythagorean Theorem-Word Problems-Geometry Help-MooMooMath

Pythagorean Theorem Examples
In this video you will learn...
• How to solve a word problem using the Pythagorean Theorem
• Simple rules for setting up Geometry word problems
• How to apply the Pythagorean theorem to find the hypotenuse of a right triangle
• If given two sides of a right triangle how to find the missing side. * Check out my site MooMooMath http://www.moomoomath.com/ * Subscribe https://www.youtube.com/channel/UCE_W... * Google+ https://plus.google.com/u/0/+MooMooMa... * Pinterest https://www.pinterest.com/moomoomath/

Sunday, April 19, 2015

Geometry Help-Circles-Tangent and Radius-MooMooMath

MooMooMath provides helpful Geometry videos. In this video tangent and radius of a circle is covered.When you combine the radius of a circle, along with the point of tangency, a right triangle can be created. The Pythagorean Theorem can be used to calculate missing parts of the triangle and circle, along with the tangent lengths. These measurements include leg length,circle radius, and the hypotenuse.

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Saturday, April 18, 2015

Surface Area of a Rectangular Prism-Geometry Help

Step by step directions for finding the surface area of a rectangular prism measuring 5 units by 5 units by 4 units

Questions answered this video..
How do you find the total surface area of a rectangular prism?

How do you find the area of the top and bottom of a rectangular prism?
How do you find the area of the sides of a rectangular prism?

If you have a rectangular prism with sides of 4 units and a top of 5 units in length?

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Monday, April 13, 2015

Finding the area of a circle and the sector area

The video explains how to find the area of a sector and how to find the sector area of a circle. Please see the video guide for more detail.

Circles part 2 lesson 4

Video Guide
00:13 Definition of a sector
00:35 Formula for area of a circle
00:40 Sample problem- finding the area of a circle when given the radius
01:26 Sample problem - finding the area of a circle when given the diameter
02:21 Formula for area of a sector reviewed and explained
03:48 Sample problem - find the area of a sector
04:50 Sample problem - find the area of a sector
06:29 Sample problem- find the area of a circle given the sector area
09:20 Sample problem - find the radius of a circle given a central angle and the sector area

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Sunday, April 12, 2015

Congruent triangles-Geometry Help

Introduction to congruent triangles. This video explains five methods for proving that triangles are congruent. The five methods for triangle congruence are
SSS Side Side Side

SAS Side Angle Side

ASA Angle Side Angle

AAS Angle Angle Side

HL Hypotenuse Leg
In addition each method has several examples and explains why the triangles are congruent along with tips and guidance from a veteran Geometry teacher.

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Friday, April 10, 2015

Finding the surface area and the volume of a sphere

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Saturday, April 4, 2015

Slope intercept form explained.

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What is absolute value?

Tuesday, March 31, 2015

What is a transversal in geometry?

Diagonal Length Rectangular Solid

Monday, March 30, 2015

What is an Isosceles Trapezoid?-Geometry Help

Perimeter of a square

Sunday, March 29, 2015

How to write algebraic expressions

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Friday, March 27, 2015

Negative and positive slopes

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Thursday, March 26, 2015

Finding the height of an equilateral triangle-Geometry Help

Area of a Triangle on a coordinate plane

Finding the Area of a Triangle

How to find the area of a triangle.

Common Core Standards: 6.G.1 – Find the area of right triangles, other triangles, special quadrilaterals, and polygons by composing into rectangles or decomposing into triangles and other shapes; apply these techniques in the context of solving real-world and mathematical problems.

7.G.6 – Solve real-world and mathematical problems involving area, volume and surface area of two- and three-dimensional objects composed of triangles, quadrilaterals, polygons, cubes, and right prisms.

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