Help please and thanks

Part A= 100°

Part B= 75°

Part C= 120°

Part D= 70°

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answer: give more info

step-by-step explanation:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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