Classify polygons and quadrilaterals

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Learn it Polygons are named by sides: pentagon 5, hexagon 6, heptagon 7, octagon 8. Quadrilaterals: a square has 4 equal sides and 4 right angles; a rectangle has 4 right angles; a rhombus has 4 equal sides; a trapezoid has one pair of parallel sides. The angles of any quadrilateral add to 360°.

Example: Three angles of a quadrilateral are 90°, 90° and 110°.

They add to 290°.
360 − 290 = 70°.

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