1. What will we accomplish? We will review the naming of polygons. We will classify quadrilaterals by their characteristics.

2. A polygon is a closed plane figure formed by three or more line segments. A regular polygon’s sides are all equal in length. Polygons are named by the number of their sides and angles.

3. Name of PolygonNumber of Sides 3 4 5 6 7 8 9 10 12 nn-gon Are you familiar with these terms? Triangle Quadrilateral Pentagon Hexagon Heptagon Octagon Nonagon Decagon Dodegacon

4. The Wonderful World of Quadrilaterals

5. We will learn to identify, classify, and compare quadrilaterals. parallelogram trapezoid rectangle square rhombus kite

6. Parallelogram Parallelogram with four right angles. Trapezoid Rhombus Parallelogram with four congruent sides. Rectangle Square Rectangle with four congruent sides. Opposite sides are parallel and congruent. Opposite angles are congruent. Quadrilateral with exactly two parallel sides. May have two right angles. Kite Quadrilateral whose four sides can be grouped into two pairs of equal-length sides that are adjacent to each other.

7. QuadrilateralParallelogramRhombusRectangleSquareTrapezoidKite A quadrilateral is a plane figure with four sides and four angles. A parallelogram is a quadrilateral with opposite sides equal and parallel. A rhombus is a parallelogram with four equal sides A rectangle is a parallelogram with opposite sides equal and Parallel and four right angles A square is a rectangle with four equal sides. A trapezoid is a quadrilateral with ONLY one pair of parallel sides. A quadrilateral with two sets of adjacent, congruent sides.

8. Review Discussion Complete each statement. 1. A quadrilateral with four right angles is a _________. 2. A parallelogram with four right angles and four congruent sides is a _______. 3. A figure with 4 sides and 4 angles is a ______. 4. Give the most descriptive name for this quadrilateral. square square or rectangle quadrilateral trapezoid ? ? ?

9. True or false? 5. A rectangle is always a square but a square is not always a rectangle. 6. A square is always a rhombus but rhombus is not always a square. 7. All rectangles are regular polygons. 8. Squares and rhombi are regular quadrilaterals. true false true

10. What have we accomplished? We have named and classified polygons.