Question

Find the area of a semicircle when its (1) radius is 21​

Answer 1

Answer:

$area \: of \: semicircle = \pi {r}^{2} \div 2$

$= ((22 \div 7) \times {21}^{2} ) \div 2$

$= 11 \times 63 = 693$

Step-by-step explanation:

Answer 2

Answer:

A≈1385.44cm²

Step-by-step explanation:

Please mark me as brain list.