Question

the circumference of a circular plate is 78.50 what is its area

Answer 1

to work out the area of a circle
\[A=pir ^{2}\]
to work out circumference
\[C=\pi(d)\]

d=2r

so you know circumference is 78.50

78.50=pi(d)

work out d

d=2r
divide d by 2 to get r


then use the area formula