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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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Q: The diameter equals 18cm how do I find the area?

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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

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area=basexheight=18x5=90

OK, SO to find the area of a circle, you find the radius (half of the diameter), and fit it into the equation πr2=A where r equals radius and A = area. The perimeter of a circle is π multiplied by the diameter. π is ≈ 3.1415296.

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

To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)

circumfrence: divide it by π (3.14). Diameter: divide by 2. area: find diameter and divide by 2.

Diameter is 8.64444

Circumference= 3.14 x Diameter Area of circle= 3.14 x diameter x diameter

Total surface area including the two end pieces: (2*pi*radius2) + (pi*diameter*height) Area = 240*pi square inches

To find the diameter of a circle, you will either need to know the area or its circumference. If you know the area: diameter = 2 x squareroot(area / Pi) If you know the circumference diameter = circumference / Pi

I assume that you are referring to the area of a circle. You divide the diameter in half to find the radius and then you put it into the formula.

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