Question

if the radius of a sphere is 10.5 cm what is the surface area of the sphere

Answer 1

When the question , simply says surface area then it want to ask total surface area.  Radius = 10.5cm Total surface area = 4πr^2   = 4 × 3.14 × 10.5 × 10.5   = 1386

Answer 2

given radius =10.5
csa of sphere =
4×22÷7×10.5×10.5
=1386