Question

Oblicz pole pow. kuli o objętości równej 4.5 pi cm3.

Answer 1

V = 4/3pi*r^3 = 4,5pi /:pi

4/3r^3=9/2 /*3/4

r^3=27/8

r=3/2 cm

 

P = 4pi*r^2 = 4*(3/2)^2 *pi =

= 4*9/4 pi = 9pi cm^2