Lesson: Geometry Intermediate - 02

Quadrilaterals

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A quadrilateral is a four-sided closed figure with straight sides. Parallelograms, rectangles, and squares are all quadrilaterals.

The interior angles of a quadrilateral always sum to 360°.

w° + x° + y° + z° = 360°

Most of the quadrilaterals that you'll see on your standardized test will either be squares or rectangles. Often they will be combined with triangles and circles in some way.

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