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Formula for exact area of a circle?
pi x square of radius
What is the exact area of a circle whos diameter is 6 cm?
There is no way to find the exact area of a circle. The formula for the area is Pi times the radius squared. But Pi is an irrational number -- that is, no matter how many numbers you write it out to, you could always write it further. Since there is no exact value of Pi there can be no exact value of the area based on the diameter. The radius is half that of a diameter. Therefore, if you know the diameter you know the radius. In this case the radius is 3cm and the area of the circle = pi * 32 So the answer is roughly
What is the area of circle with a radius of 1.2cm?
Area = (pi * radius)^2, so: Area = (pi * 1.2cm)^2 Area = 1.44 pi cm (an exact value) If you want to approximate the area, just multiply 1.44 by pi.
What is the exact area of a circle with the circumference of 4 square roots of 3 times pi?
circ = pi x diameter = pi x 4 sqqrt(3) so radius = 2 x sqrrt(3) and radius squared = 12 so area = pi radius squared = 12 pi
What is the area of a circle with a 13 inch radius?
530.9291585 squared inches to be exact. * * * * * To be exact? Since when has it been possible to express an exact multiple of pi?
