*Learning Goal: Apply understanding of sector area to an inquiry-based task and explore the similarities and differences between arc length and sector area.*

# Classwork

- Warm Up
- Lava Field [3 Act Math]
- Use big whiteboards and have each group member write with different colors
- Write pre-scripted questions for audience members to ask during presentations

- Practice
- Some parts taken from New Visions

# 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**