Mathematics

Problem

For a cross section that is an equilateral triangle with side length

s

, which of the following expressions gives the area

A

of the cross section? a)

\dfrac{1}{2}s^{2}

\dfrac{3\sqrt{3}}{4}s^{2}

\dfrac{\sqrt{3}}{4}s^{2}

\dfrac{\sqrt{3}}{2}s^{2}