Answer:
A≅562.45π u²
Step-by-step explanation:
Knowing that the volume the a solid is V=πR²h, then A=πR², therefore
A=π(4√x), integrating on both sides ∫A=4π∫√xdx ⇒ ∫√xdx = [tex]\frac{2}{3}x^{3/2}[/tex]
evaluated (60,77), then
[tex]A=\frac{8\pi }{3}(77^{3/2}-60^{3/2})\\A=\frac{8\pi }{3}(675.67-161.75})\\A=562.45\pi[/tex]
