Will give medal if someone can explain how to find the answer!
The vertices of a parallelogram are A(x1,y1), B(x2,y2),C(x3,y3)D(x4,y4)
Which of the following must be true if ABCD is proven to be a rectangle.

Question

Will give medal if someone can explain how to find the answer!
The vertices of a parallelogram are A(x1,y1), B(x2,y2),C(x3,y3)D(x4,y4)
Which of the following must be true if ABCD is proven to be a rectangle.

anonymous · Answer

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anonymous · Answer

If it's a rectangle, opposite sides are congruent, so AB is the same length as CD, BC the same as AD. The first part of the answer is side lengths using the distance formula. The first side in each answer is CD, so the second one has to be AB. So we can eliminate the first and fourth answers.

anonymous · Answer

ok I knew the 4th one was out.

anonymous · Answer

I'm not sure what the second half of the answer is. Sorry.

anonymous · Answer

ok thanks

anonymous · Answer

oh I fiqured it out
and yes it was the 3rd one. Thanks again!!!