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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
From an earlier course.
A dilation is a transformation that can reduce or enlarge a figure.
A dilation with center
Triangle
To create a scaled copy of a figure, all the side lengths in the original figure are multiplied by the same number. This number is called the scale factor.
In this example, the scale factor is 1.5, because
From an earlier course.