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The sines of two angles of a triangle are equal to 5/13 & 99/101. The cosine of the third angle is

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The sines of two angles of a triangle are equal to 5/13 & 99/101. The cosine of the third angle is

(A) 245/1313

(B) 255/1313 

(C) 735/1313 

(D) 765/1313 

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1 Answer

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Best answer

Correct option (B) 255/1313

Explanation:

sinA = 5/13A =  acute angle

sinB = 99/101 ~ 1

B ~ 90

C will be acute angle.

cos C > 0

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