Answer:
h=3V/πr²
Step-by-step explanation:
TWENTY ONE BA DUM DUM DUM
(4^2+8^2)^.5 = 8.944
It's not 12.
So 4,8,12 can't be the side lengths of a right triangle.
Answer:
3/4
Step-by-step explanation:

Effectively, divide both numerator and denominator by their greatest common factor, 12.
Answer: 5
Step-by-step explanation:
r³=125=
r*r*r=125
so
r=5