91Ó°ÊÓ

In an isosceles trapezoid, the length of the lower base is 15 , the length of the upper base is 5, and each congruent side is of length 6 (see figure). By how many units must each nonparallel side be extended to form a triangle?

In right triangle \(\mathrm{ABC}\), altitude \(\underline{\mathrm{CD}}\) is drawn to hypotenuse \(\underline{A B}\), as seen in the figure. If \(A D=6\) and \(D B=24\), find 9

Show that the medians of a triangle are concurrent at a point on each median located two-thirds of the way from each vertex to the opposite side.