Area = pi*r^2
r(radius) = diameter/2
24 cm/2 = 12 cm radius
Area = pi(12 cm)^2
~ 452 sq cm
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Area of circle: pi times radius squared
Centimeter is a measurement unit in the metric system. The diameter is not a measurement unit. The diameter of a circle is twice the length of the radius of the circle.
Circumference of a circle = 2*pi*radius or pi*diameter Area of a circle = pi*radius squared
A diameter is the size of a circle from edge to edge when measuring through the centre. Consequently, as a circle can be any size, there can be any number of centimetres in the diameter..
Area of a circle is PI times the square of the radius (half the diameter). 3.1415 x (7.5 squared) = about 176.7 square feet