Question

Calculate (a) the circumference of a circle of radius 3.5 cm and (b) area of a circle of radius 4.65 cm

Answer 1

Circumference =
$2\pi r$
2 ×(22/7)×(35/10)=11cm(ans)
Area =
$\pi {r}^{2}$
(22/7)×465/100? = 68(approx)(ans)