Help please, forgot how to do this

The circumference of a circle is given by the formula C = 2πr. Find r if the circumference C is 176 meters and π is 22/7.
r= ?m

Solve for the indicated variable.
V= 1/3πr^2h for h
h=?

1).
The circumference of a circle is given by the formula C = 2πr.
Find r if the circumference C is 176 meters and π is 22/7.
r = C/2.pi = 88*7/22
r = 28 m

2).
Solve for the indicated variable.
V = (1/3)πr^2h for h
3V = pi.r^2h
h = 3V/pi.r^2

r = 2π / C....plug the value in for 'C'.

&

h = 1/3πr^2V