The formula for working out the area of a circle is \(\pi\)\(r^{2}\). r stands for the radius. The radius is the diameter divided by two.
r = d/2
r = 8cm/2
= 4cm
Now you just need to substitute r into the formula for the area of a circle:
\(\pi\)\(4^{2}\)
= \(\pi\)*16
= 16\(\pi\)\(cm^{2}\) (Remember that the area is always given in units squared, in this case cm)
≈ 50.3 \(cm^{2}\)
