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From the figure, Find the value of $a + b$ .

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60°

75°

85°

90°

answer is D.

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Detailed Solution

$b = 60 °$

$2 a + b + 60 ° = 180 °$

$2 a = 60 °$

$a = 30 °$

$a + b = 60 + 30 = 90 °$

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