Lesson: The Sum of Angles in Quadrilaterals Mathematics

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In this lesson, we will learn how to find a missing angle’s measure in a quadrilateral knowing that the sum of angles in a quadrilateral is 360 degrees.

Lesson Plan

Students will be able to

understand that the sum of the interior angles in a convex quadrilateral is 360 degrees,
use the fact that the sum of the interior angles in a convex quadrilateral is 360 degrees to find a missing angle measure in a given quadrilateral,
construct and solve an algebraic equation to find a missing angle measure in a given quadrilateral,
use angle facts to find a missing angle measure in a quadrilateral that appears within a more complex geometric diagram.