Question

4. Find the area of a semicircle when its
(i) radius is 21 cm.
​

Answer 1

2*22/7*21*21

2*22*7*21

44*7*21

6468

Answer 2

Answer:

Step-by-step explanation:

→ Area of a semi-circle = 1/2 π r²

→ radius = 21 cm

→ 1/2 × 22/7 × (21)²

→ 22/14 × 441

→ 22÷2/14÷2 = 11/7

→ 11/7 × 441

→ 4857/7

→ 693.85 cm²