Match the vocabulary word with the correct definition 1. projection of a segment on a line
A:the portion of a line with endpoints that are the projections of the endpoints of the segment
2. projection of a point on a line
B:For any positive real numbers a, b, and x, if then x is called the between a and b. Notice that or .
3. altitude of a triangle
C:in a triangle, the perpendicular line from a vertex to the opposite side
4. geometric mean
D:the point where a perpendicular through the point to the line intersects the line