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Arizona Math Standard: 4.MD.C.7

Understand angle measures as additive. (When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts.) Solve addition and subtraction problems to find unknown angles on a diagram within mathematical problems as well as problems in real-world contexts.

Intersecting Angles and Streets

Intersecting Angles and Streets

There can never be just one angle.

The Angles of a Triangle

The Angles of a Triangle

Why tell a kid the rules of a triangle when they can discover them!?