May 19, 2015

In this Youtube video from TheDouceHouse, he discusses 2 different ways of measuring arc length, by degrees and by distance such as inches. He also show 3 different example problems, problems you will likely see in class, on how to find arc length using a proportion. The three different example have you find arc length, central angle, and radius of circles.

- 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.