# Geometric Shapes

## Altitiude

An altitude (for a triangle) is a line through the vertex that is perpendicular to the opposite side. A perpendicular line is a line that intersects another line in such a way to form right angles.   An altitude (for a quadrilateral with a pair of parallel sides) is a line perpendicular to a base to the opposite side.

## Diagonals

A diagonal is a line that runs from one vertex to another.

## Perpendicular Bisector

A perpendicular bisector is a line that is perpendicular and bisects another line. A bisector is a point or line that intersects another line such that the length on either side is equal.

## Central Angle

The central angle is the angle created by 2 segments that intersect at the center of the circle and begin at a point on the circle.

The radius (plural radii) is a line segment that goes from the center of the circle to any point on the circle.

## Chord

A chord is a line segment that runs from one point on a circle to another.

## Diameter

A diameter is a chord that runs through the center of the circle.