গাণিতিক যুক্তি MCQ
The tops of two poles are connected by a wire. The heights of the poles are 10 m and 14 m respectively. If the wire makes a 30° angle with the horizontal, find the length of the wire?
সঠিক উত্তর
8 m
Let AD and BE, be the poles of height 10 m and 14 m respectively.DE is the wire of length = LDC is parallel to AB so AD = BC = 10 mSo, CE = BE - BC = 14 - 10 = 4 mIn ΔDCE,sin30° = CE/DE⇒ 1/2 = 4/L⇒ L = 8