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Question

In ∆ABC, if ∠A − ∠B = 42° and ∠B − ∠C = 21°, ∠B = ?
(a) 95°
(b) 53°
(c) 32°
(d) 63°

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Solution

(b) 53°

Let
A-B=42° ...i andB-C=21° ...iiAdding (i) and (ii), we get:A-C=63°B=A-42° Using iC=A-63° Using iii

A+B+C=180° Sum of the angles of a triangleA+A-42°+A-63°=180°3A-105°=180°3A=285°A=95°B=95-42°B=53°

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