Question: D 18. Given: Quadrilateral ABCD; AB = CD; AB II CD; BF and DE are F perpendicular to diagonal AC at points F and E.

D 18. Given: Quadrilateral ABCD; AB = CD; AB II CD; BF and DE are F perpendicular to diagonal AC at points F and E. E Prove: AE = CF B 19. In the coordinate plane, the vertices of ARST are R(6, -1), S(1, -4), and T(-5, 6). Prove that ARST is a right triangle. [Use of the accompanying grid is optional.] State the coordinates of point P such that quadrilateral RSTP is a rectangle. Prove that quadrilateral RSTP is a rectangle

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