1.

Find angle BDC shown in the figure below.(a) 30(b) 65(c) 60(d) 45

Answer» Correct option is (d) 45

Easiest explanation: Given both the perpendiculars are equal so according to postulate, equal side has equal angle opposite to it.

So, angle ADB = angle BDC, on equating both angles as 7x+17 = 3(4x – 1)                                                                                x=4, and angle BDC = 45.


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