Explanation:
the volume of a regular shape is always
ground area × height
9.
so, the ground area is 12 cm².
the whole volume is 288 cm³.
therefore,
288 = 12 × height
height = 288/12 = 24 cm.
10.
we do this almost exactly the same way.
but here we have no regular shape (uniform from the bottom to the top). we have a pyramid.
the volume for a pyramid is
ground area × height / 3.
the ground area is 300 cm².
the volume is 2,050 cm³.
2,050 = 300 × height / 3.
6,150 = 300 × height.
height = 6150/300 = 20.5 cm