## 23 terms

### How do you locate the circumcenter of a triangle?

perpendicular bisectors

### What's special about the circumcenter? (THM)

equidistant from the three vertices of a triangle

### Can the circumcenter lie inside, outside, or on the triangle?

inside, outside, or on

angle bisectors

### What's special about the incenter? (THM)

equidistant from the 3 sides of a triangle (perpendicular distance to the sides)

inside

medians

### What is special about the centroid of the triangle? (THM)

2/3, 1/3 split; vertex to midpt on opp side

inside

altitudes

### Can the orthocenter lie inside, outside, or on the triangle

inside, outside, or on

### Has 4 sides

quadrilateral, parallelogram, rectangle, rhombus, square, trapezoid, isosceles trapezoid, and kite

### Both pairs of opposite sides are parallel

parallelogram, rectangle, rhombus, square

### Exactly one pair of opposite sides are parallel

trapezoid and isosceles trapezoid

### Diagonals are perpendicular

rhombus, square, kite

### Diagonals are congruent

rectangle, square, isosceles trapezoid

rhombus, square

### Both pairs of opposite sides are congruent

parallelogram, rectangle, rhombus, square

### Has 2 pairs of congruent sides

parallelogram, rectangle, rhombus, square, and kite

### Diagonals bisect each other

parallelogram, rectangle, rhombus, and square

square

### Both pairs of opposite angles are congruent

parallelogram, rectangle, rhombus, square

### All angles are congruent

rectangle and square