The answer would be A because all angles on a triangle must equal 180 degrees and since the first two angles add up to 100 the last angle must be 80.
Answer from: Quest
step-by-step explanation:
Answer from: Quest
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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