# Introducing Angles in a Quadrilateral

Students are introduced to angles in a quadrilateral by investigating how they are formed from two triangles.  More able students learn how to prove this property using algebra.
##### Differentiated Learning Objectives
• All students should be able to calculate a missing angle in a scalene quadrilateral.
• Most students should be able to calculate missing angles using the unique properties of each quadrilateral.
• Some students should be able to prove the sum of the angles in a quadrilateral.

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