Question

Find the areas of circles whose radii are

(1) 14 cm

(2) 21 cm

(3) 10.5 cm

(4) 3.5 cm

Answer 1

(1) Area, A = πr² = π × r × r = × 14 × 14 = 616 cm²

(2) Area, A = πr² = π × r × r =× 21 × 21 = 1386 cm²

(3) Area, A = πr² = π × r × r = × 10.5 × 10.5 = 346.5 cm²

(4) Area, A = πr² = π × r × r =× 3.5 × 3.5 = 38.5 cm²