Finding radius circle from arc length-Geometry Help-MooMooMath

Finding the radius of a circle from arc length.


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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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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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