*Learning Goal: Allow students to explore sector area before formally teaching it. Then, practice and spiral important concepts.*

# 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**