Question

A paint can holds 2.5 litres. (1 litre=1000cm^3)

Answer 1

The volume of the can = area x height 
2500 = pi*r^2 * 15
r^2 = (2500)/(pi*15) 
r = √((2500)/(pi*15))
r = 6.86 cm 
the radius of the can is 6.68 cm