Question

Is it possible to construct a ∆ABC in which BC = 5 cm, ∠B = 120° and ∠C = 60°?
(a) Yes
(b) No

Answer 1

(b) No
It is because the sum of two angles of a triangle is always less than 180°.
Here, the sum of $\angle B\mathrm{and}\angle C$ is 180°.