Question

The vertices of a parallelogram are A(x1, y1), B(x2, y2), C(x3, y3), and D(x4, y4). Which of the following must be true if parallelogram ABCD is proven to be a rectangle?
WILL METAL AND FAN!!!!

Answer 1

those are the points so i dont know what your question is asking

Answer 2

MY FIRST CHOICE IS
A= (Y4-Y-3/X4-X3= Y2-Y3/X3-X2) AND Y4-Y3/X4-X3 TIMES Y3-Y2/X3-X2

Answer 3

OH AND THAT = -1

Answer 4

LOOKING FOR AN ANSWER LIKES THAT