*Learning Goal: Give students an opportunity to figure out how to calculate the length of an arc on their own before moving into formal notes and practice.*

# 3 Act Math

# Classwork

# Standards:

**Common Core**- HSG.C.B.5 – 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.

**TEKS**