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The sides of a triangle are in the ratio `1: sqrt3:2.` Then the angles are in the ratioA. `1 : 3 : 5`B. `2: 3 : 4`C. `3 : 2: 1`D. `1 : 2: 3` |
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Answer» Correct Answer - D Sides are in the ratio `1 : sqrt3 : 2` Let `a = k, b = sqrt3 k, and c = 2k` `cosA = (b^(2) + c^(2) - a^(2))/(2bc) = (sqrt3)/(2) rArr A = (pi)/(6)` `cos B = (c^(2) + a^(2) -b^(2))/(2ac) = (1)/(2) rArr B = (pi)/(3)` `rArr C = pi - bar(A + B) = (pi)/(2)` `rArr A: B: C = 1 : 2: 3` |
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