In this prism, the red areas are the cross sections.

Take for example this question.

The cross section is the square with sides 20 cm. The area of this square is 20 cm x 20 cm = 400 cm

^{2}. The volume of the cuboid is thus 400 x 40 = 16000 cm

^{3}.

Take a more challenging question.

The cross section here is the triangle. The area of the triangle is 0.5 x 8 cm x 15 cm = 60 cm

^{2}. The volume of the prism is 60 x 10 = 600 cm

^{3}.

Try this question.

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