The general equation for the area of a circle is π*r2, where r is the radius of the circle, and π is pi, which is approximately 3.14159. The diameter of a circle is how far it is from one side of the circle to the other, and the radius is how far it is the from edge to the center, thus the radius is half the diameter. Therefore the area is π*(92) ~ 254.47
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area=basexheight=18x5=90
The Lateral Area of a cylinder with diameter of 12 cm and a height of 20 cm is equivalent to 0.075 square meter. Diameter of 12 cm is equals to 0.06 meter in radius and height of 20cm is equals to 0.2 meter
Circumference= 3.14 x Diameter Area of circle= 3.14 x diameter x diameter
Area = Pi(d/2)2 where d = diameter
Area of Circle = pi (radius)2 So , using this formula we can find the radius and also the diameter. Diameter = 2(radius)