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ABCD is a trapezium with AD || BC , angle ABC = angle BAD = 90° , and DE = EC = BC . Prove that angle DAE = 1/3 angle AEC.

ABCD is a trapezium with AD || BC, angle ABC = angle BAD = 90°, and DE = EC = BC. Prove that angle DAE = 1/3 angle AEC.

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Grade:9

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