Question

Measure of reflex ∆OBA is-
a) 30°
b) 60°
c)240°
d) 330°​

Answer 1

Answer:

∠A = ∠C = 60o and ∠B = ∠D = 120o (i) In ∆ APB, ∠PAB = 60°2=30° and ∠PBA = 120°2=60° ∴ ∠APB = 180o − (30o + 60o) = 90o