Formula used: Sum of interior angles of hexagon = (n – 2) × 180 Where n is the number of sides of the polygon Calculation: Let the interior angles of the hexagon be 2a, 3a, 3a, 5a, 5a, 6a. Sum of interior angles of hexagon = (6 – 2) × 180 ⇒ 2a + 3a + 3a + 5a + 5a + 6a ⇒ 24a = 4 × 180 ⇒ a = 30o ∴ Smallest angle = 2a = 2 × 30 = 60o