Lesson 3: 1.3 Angles

How do we visually identify acute, obtuse, and right angles?
What are adjacent and vertical angles in real-world intersections?

Angle
Vertex
Acute
Obtuse
Right
Straight
Reflex

CCSS.G.CO.A.1

I DO: Use a door to show angles opening (acute -> right -> obtuse). Show how to line up a protractor's vertex.
WE DO: Use clothespins attached to paper circles to physically "open" and "close" angles, estimating their classification before measuring.
YOU DO: Measure a worksheet of 8 angles using a protractor and classify them into categories.
Understand angle types for structural design and spatial awareness.
DOK 2 (Skill/Concept)

Support (Low): Picture sorting activity (sorting visual cards into acute/obtuse bins) rather than exact measurement.
Extension (High): Calculate missing complementary and supplementary angles using algebra.

Formative Assessment

Protractors

Clothespins and paper plates/circles

Digital angle manipulatives