Question

If in ΔABC, ∠A + ∠B = 110 °and ∠B + ∠C = 150° , find ∠B.​

Answer 1

Answer:

(<A+<B)+zC=180° (angle sum property)

150°+2C=180°

ZC-180°-150°

ZA+(2B+ZC)=180° (angle sum property)

ZA+100=180°

ZA=180°-100°

..ZA=80°

ZA+ZB+ZC=180° (angle sum property)

80°+B+30°=180°

ZB=180°-110°

..<B=70°