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Question

In a triangle ABC, AB = 1, AC = 2 andA=600,its largest angle is equal to



A

75°

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B

90°

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C

120°

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D

135°

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Solution

The correct option is B

90°


Given, c = 1, b = 2A=600cosA=4+1a24=125a2=2a=3Clearly a2+c2=b2ΔABC is a right triangle.largest angle=900


Mathematics

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