maths problem try to solve it

Here's a "right pyramid" .ABCD are square and VNA are 90 degrees.
If VA=10cm and ABCD area=72cm(square)

Fine a) CA lengh
b) VN lengh
c) this right pyramis voleum

Ans: A) 12cm B) 8cm C)192 cm(cube)

Three bowls ABC put together.IF A diameter's 15 cm, B 18 cm , C 24 cm and A depth 5 cm and voleum's 250 cm(cube).

Fine a) B and C depth
b) B and C voleum

Ans. a) B : 6 cm, C : 8 cm

a) B : 432 cm(cube) ,C : 1024 cm(cube)