Question

if the diameter of a sphere is d and the curverd surface area is S then show thay S = πdsquare

Answer 1

CSA of sphere =
$4\pi \times { \frac{d}{2} }^{2} \\ = 4\pi \times \frac{ {d}^{2} }{4 \ } \\ = \pi {d}^{2}$