If AB—≅CB—is given, how can it be proved that m∠A=m∠C?

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step-by-step explanation:

multiply length by height. multiply the length by the height, and then double the product. work out 10 x 10 results = 100 square inches, then work out 100 x 2 = 200. the answer is 200 square inches.

step-by-step explanation:

can i see a photo of the question so i can you?