Section 5.4

Section 5.4Four-Sided Polygons

By: Laura MoellerKristie Furiosi

1WHAT IS A POLYGON?A polygon is a closed figure made by joining line segments, where each line segment intersects exactly two others. The following are examples of polygons:

2WHAT IS NOT A POLYGON?The figure below is not a polygon since it is not a closed figure:

The figure below is not a polygon since it is not made of line segments:

3Naming PolygonsPolygons are named starting at one vertex, then continuing clockwise or counter-clockwise.

This polygon can be named LKBFJM, or LMJFBK starting at point L.(Polygon Laura Kristie Beatrice Furiosi Jane Moeller)LKBFJM4Diagonals of PolygonsDiagonals are the segments that connect two nonconsecutive vertices of the polygon.

LV and EO are diagonals of rectangle LOVE.LOVE5QUADTILATERALSQUADRILATERALS: four-sided polygons

The following are examples of quadrilaterals:6TYPES OF QUADRILATERALSPARALLELOGRAM- a quadrilateral in which both pairs of opposite sides are parallel or congruent. KFLMKFLM7TYPES OF QUADRILATERALSRECTANGLE- a parallelogram in which at least one angle is a right angleHANK