Volume of a frustum

Volume of a frustum
Q1 Calculate the volume of the following frustums
a)
Radius of smaller cone = 5cm
Radius of larger cone = 10cm
Radius of smaller cone = 5cm
Radius of larger cone = 15cm
b)
10cm
8cm
16cm
30cm
r
r
r
r
Q2 Calculate the volume of the frustum that
is left behind when the top of a cone is
removed.
Radius of top of frustum = 6cm
Radius of base of frustum = 9cm
10cm
r
5cm
r