Correct Answer: Option C
ধরি, তিনটি কোণ যথাক্রমে , x, 2x, 3x
এখন, x + 2x + 3x = 1800
বা, 6x = 1800
বা,x = 1800/6
বা, x = 300

এখন,
2x = 2 × 30 = 600
3x = 3 × 30 = 900
আমরা জানি,
cos 600 = AB/AC
বা, 1/2 = AB/6
বা, AB = 3 cm
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