In the following figure, the measure of ∠A is______.

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70°

100°

110°

80°

answer is D.

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Detailed Solution

We know that the sum of a triangle's internal angles is 180 degrees. Let x be the third angle in all of the triangles. Therefore,
60° + 40° + x = 180°
x = 180°- 100°
x= 80°

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