EM-2171

Volume and surface area of solids

E Math · Secondary 4 · Medium · Volume and surface area of solids

A solid is a prism whose cross-section is a regular pentagon of side 5 cm. The length of the prism is 20 cm. Find the volume of the prism.

(Use

\text{Area of regular pentagon} = \frac{5s^2}{4\tan 36°}

and

\tan 36° = 0.727

Loading problem…