Mathematics

Problem

For a semicircular cross section with diameter of length

d

, which expression gives the exact area

A(d)

of that cross section in terms of

d

? a)

\dfrac{\pi d^{2}}{4}

\dfrac{\pi d^{2}}{16}

\dfrac{\pi d^{2}}{8}

\dfrac{\pi d^{2}}{2}