May 19, 2015

This Youtube video from Eric Hutchinson from the College of Southern Nevada shows how to derive the formula for the area of a sector. Then examples will follow that illustrate how to use the formula

- Mathematics > General
- Mathematics > Geometry

- Grade 9
- Grade 10

Reason abstractly and quantitatively.

Construct viable arguments and critique the reasoning of others.

Use appropriate tools strategically.

Attend to precision.

Derive using similarity the fact that the length of the arc intercepted by an angle is proportional to the radius, and define the radian measure of the angle as the constant of proportionality; derive the formula for the area of a sector.