If the angles of a triangle are in the ratio 2: 1: 3, then find the measure of smallest angle.
Let,
∠1 = 2k, ∠2 = k and ∠3 = 3k
∠1 + ∠2 + ∠3 = 180°
6k = 180
k = 30o
Therefore, minimum angle be ∠2 = k = 30o.