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Listed under:  Mathematics  >  Geometry  >  Angles  >  Parallel line angles  >  Co-interior angles
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Angle strength

Students calculate unknown angles using angle relationships.

Online

TIMES Module 20: Measurement and Geometry: parallelograms and rectangles - teacher guide

This is a 17-page guide for teachers. It contains the definitions, properties and tests for parallelograms and rectangles. Proofs of the properties and tests are given. Constructions for parallelograms and rectangles are given.