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Suppose the area of the ΔABC is 10√3 . Length of segments AC and AB be 5 and 8 respectively. Then the angle A is (are) :(A) 45° or 135° (B) 30° or 150°(C) 90° (D) 60° or 120° |
Answer» Correct option (D) 60° or 120° Explanation: Let sides A B , BC & A C be c,a,b respectively in ΔABC . Area of triangle =1/2 bc sin A ⇒ 10√3 = 1/2 5.8 sin A ⇒sin A = √3/2 ∴ 60° or 120° |
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