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How do you prove a trapezoid is isosceles?

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User Wpigott
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Answer:

A trapezoid is isosceles if and only if its diagonals are congruent. So if we can prove that the bases are parallel and the diagonals are congruent, then we know the quadrilateral is an isosceles trapezoid, as Cool Math accurately states.

Explanation:

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User Samuels
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