Three angles of a quadrilateral are in the ratio 3 : 4 : 5 : 6. The smallest of these angles is
Let the angles be 3x, 4x, 5x and 6x
3x + 4x + 5x + 6x = 360o (Sum of angles of a quadrilateral)
18x = 360o
x =
x = 20o
∴ Angles of the quadrilateral are:
3x = 3 × 20o = 60o
4x = 4 × 20o = 80o
5x = 5 × 20o = 100o
6x = 6 × 20o = 120o
Hence, the smallest angle is 60o
∴ Option (B) is correct