Answer 1

Radius (r) = 4.2 cm

Circumference = 2 × r

`= 2xx22/7xx4.2`

`= (44/10xx 6) = 264/10`

 = 26.4 𝑐𝑚

`Area = pir^2 = 22/7xx4.2xx4.2`

`=(22xx6xx42)/(10xx10)`

`=5544/100`

`55.44cm^2`