1. Objectives :  Recognize polygons  Name polygons  Recognize convex polygons  Find diagonals of a polygon  Identify special types of quadrilaterals 5.4

2.  Plane figures  Consists only of segments  Consecutive sides intersect at endpoints  Consecutive sides are noncollinear

3.  Start at any vertex then proceed either clockwise or counterclockwise A B FC E D

4. convex – each interior angle has a measure less than 180° Example: a)b) For our class, we will be using only convex polygons unless the problem states otherwise. 5.4

5. diagonal – a segment that joins two nonconsecutive vertices 5.4

6. Quadrilateral: a four sided polygon Parallelogram: a quadrilateral with both pairs of opposite sides parallel Rectangle: a parallelogram with at least one right angle Rhombus: a parallelogram with at least 2 consecutive congruent sides Kite: a quadrilateral in which 2 pairs of consecutive sides are congruent, but opposite sides are not congruent * 5.4

7. Square: a parallelogram that is both a rectangle and a rhombus Trapezoid: a quadrilateral with exactly 1 pair of parallel sides Isosceles Trapezoid: a trapezoid with the non-parallel sides congruent 5.4