Area = (pi) x (Radius)2
(Radius)2 = Area/pi
Radius = sqrt(Area/pi)
Diameter = 2 x radius = 2 x sqrt(Area/pi)
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Measure the diametre of the circle and divide by two to give the radius.
An ordinary dinner plate has a diametre of 32cm, which gives it a radius of 16cm a= pi * r2 a = 804 cm
Surface area = (2*pi*32) + (pi*6*9)) = 72*pi which is about 226 square cm
It is 25cm
92mm