Q: The area of a circleis 78.5cm2 What is the cicumference of the cicle?

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Do you mean circle? The area of a circle is pi times the radius2.

cicumference = pi*5 cm area = pi*2.52 square cm

Area of a circle = pi*radius squared

Assuming you know the radius - the formula is Pi x Radius2

I'm sorry the question isn't clear enough. A four foot diameter? radius? area?

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Do you mean circle? The area of a circle is pi times the radius2.

12.5 km

cicumference = pi*5 cm area = pi*2.52 square cm

Area of a circle = pi*radius squared

Assuming you know the radius - the formula is Pi x Radius2

I'm sorry the question isn't clear enough. A four foot diameter? radius? area?

Circumference = pi*30 = 94.248 inches rounded to 3 decimal places Area = pi*152 = 706.858 square inches to 3 decimal places

pi*r2 = 400*pi Therefore radius = 20 meters Cicumference = 2*pi* radius = 40*pi meters

Given is a circle. Not known is its area A. Not known is its radius r. Not known is its diameter d. You want to calculate its circumference C. Impossible. It cannot be calculated. The only other way is to measure it with a tape measure.

If the cicumference is 10 feet:- Then radius = 10/(2*pi) = 1.591549431 feet Area = pi*1.5915494312 = 7.957747155 or 7.958 square feet rounded to 3 decimal places

To find the diameter of a circle given the area. The area of a circle = pi x the radius squared. To find the radius, then the diameter transpose the area formula, so A = Π * r^2 A/ Π = r^2 √A/ Π= r 2 x √A/ Π = d A = area Π = pi = 3.142 r = radius d = diameter

it is located on the underside of the oil pan. there is a circle with a large bolt in it.There is the the filter.Clean the area around this cicle and it should have engraved writing indicating the filter is inside the oil pan.