# chapter 5 & 6

## 16 terms

### equiangular polygon

a polygon whose angles are all congruent

### equilateral polygon

a polygon in which all sides are congruent

### isosceles trapezoid

a trapezoid with congruent legs

### kite

a quadrilateral with two pairs of adjacent sides congruent and no opposite sides congruent

### parallelogram

a quadrilateral whose opposite sides are both parallel and equal in length

### rectangle

a parallelogram with four right angles

### regular polygon

A polygon with all sides congruent and all angles congruent

### rhombus

a parallelogram with four equal sides

### trapezoid

a quadrilateral with exactly one pair of parallel sides

### indirect proof

a proof in which you prove that a statement is true by first assuming that the opposite is true

### indirect reasoning

all possibilities are considered and then all but one are proved false.

### centroid

the point of concurrency of the medians of a triangle

### circumcenter

the point of concurrency of the perpendicular bisectors of a triangle.

### orthocenter

point of concurrency for altitudes

### median

segment from a vertex to the midpoint of the opposite side

### incenter

the point of concurrency of the angle bisectors of a triangle