Our goal is to create time saving videos to help students in Geometry and Math class
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.
For more information and a summary of this video go to http://www.moomoomath.com
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.
For more on equilateral triangles see
http://www.moomoomath.com/Equilateral-Triangle.html
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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?
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