Correct Answer - Option 1 : B
Given
The angles of a triangle are in the ratio 4 : 5 : 6
Concept used
Sum of all angles of triangle is 180°
Calculation
Let the angles of triangle be 4x, 5x, 6x
⇒ 4x + 5x + 6x = 180°
⇒ 15x = 180
⇒ x = 12°
∴ Smallest angle is 4 × 12 = 48°