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Find angle BDC shown in the figure below.(a) 30(b) 65(c) 60(d) 45This question was addressed to me at a job interview.My question is taken from Geometrical Construction topic in division Lettering Practice, Scales & Curves of Civil Engineering Drawing

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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