Lesson 3: 2.3 Angle Pair Sums

How do we use complementary and supplementary rules to find missing information?

Complementary
Supplementary

CCSS.G.CO.C.9

I DO: Model how to set up an algebraic equation for supplementary angles ().
WE DO: Use physical manipulatives (angles that snap together to form a straight line) to visualize the sums.
YOU DO: Solve a worksheet containing 8 variable-based angle problems.
Calculate exact missing measurements using known relationships.
DOK 2

Support (Low): Provide strong visuals; use whole numbers; provide a step-by-step calculation map.

Formative Assessment

Worksheets with built-in scaffolds

Khan Academy practice