Unit 3
Glossary
Geometry
An altitude in a triangle is a line segment from a vertex to the opposite side that is perpendicular to that side.
In this diagram, the dashed line segments show the altitude of each triangle.
Two angles are complementary to each other if their measures add up to \(90^\circ\). The two acute angles in a right triangle are complementary to each other.
From an earlier course.
A dilation is a transformation that can reduce or enlarge a figure.
A dilation with center \(P\) and positive scale factor \(k\) takes a point \(A\) along the ray \(PA\) to another point whose distance is \(k\) times farther away from \(P\) than \(A\) is.
Triangle \(A'B'C'\) is the result of applying a dilation with center \(P\) and scale factor 3 to triangle \(ABC\).