a math question

Question

Find the surface area of the figure when d = 4 cm. For calculations involving 𝜋, give both the exact value and an approximation to the nearest hundredth of a centimeter.

Answer 1

no figure is visible, but

if the figure is a circle, the surface area = pi(r^2) = pi(d/2)^2 = pi(4/2)^2 = pi(2^2)

= 4pi cm^2

= 4(3.14159) = 12.57 cm^2

if the figure is a sphere, which seems likely as there's enough information, and "surface area" is usually used for 3 dimensional figures,

then surface area = 4pi(r^2) = 4pi(2^2)

= 16pi

= about 16(3.14159) = 50.27 cm^3

if the figure is a cylinder, cone or other 3D figure, you need more information, such as the height, to find surface area