Question

Given: The coordinates of isosceles trapezoid JKLM are J(-b, c), K(b, c), L(a, 0), and M(-a, 0).
Prove: The diagonals of an isosceles trapezoid are congruent.

As part of the proof, find the length of km

Answer 1

In the coordinate plane, three vertices of rectangle PQRS are P(0, 0), Q(0, b), and S(c, 0). What are the coordinates of point R?

(2b, 2c)
(b, c)
(2c, 2b)
(c, b)