SOLUTION: Rectangle abcd has an isosceles triangle bcd, what does it tell me about the rectangle?

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Question 400433: Rectangle abcd has an isosceles triangle bcd, what does it tell me about the rectangle?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
BCD is isosceles and it is a right triangle (since angle BCD is contained within the rectangle, hence it is a right angle). Therefore, BC = CD, and since it is a rectangle, all four side lengths are equal and ABCD is a square.