# Geometry 5.4 Four-Sided Polygons

## 13 terms

### Polygons

a closed plane figure made up of line segments

### Convex Polygon

a polygon in which which interier angles have a measure less than 180

### Diagonal of a Polygon

any segment that connects two nonconsecutive vertices of the polygon

a four sided polygon

### parallelogram

A quadrilateral with both pairs of opposite sides parallel

### rectangle

a parallelogram in which at least one angle is a right angle

### rhombus

a parallelogram in which at least two consecutive sides are congruent

### kite

a quadrilateral in which two disjoint pairs of consecutive sides are congruent

### square

a parallelogram that is both a rectangle and a rhombus

### trapezoid

a quadrilateral with exactly one pair of parallel sides (called the "bases")

### isosceles trapezoid

a trapezoid in which the nonparallel sides (legs) are congruent.

### the bottom base angles in an isosceles trapezoid

lower base angles

### the top base angles in an isosceles trapezoid

upper base angles