Best Answer

Circumference = 2*pi*radius

Area = pi*radius2

Q: How do you find circumference and area of a circle if radius is known?

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The radius and area of a circle if the circumference is 157 are:r = 25A = 1,960

The circumference of a circle with a 7cm radius is 44cm. The area is 154cm2

Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared

The area and circumference of a circle with a radius of 9.5 mm are:A = 284mm2C = 59.7mm

area: pi times radius squared circumference: pi times radius

Pi is related to the area and the circumference of the circle. The area is Pi multiplied by the radius of the circle squared and the circumference is Pi times the diameter of the circle. if you're wondering how it works, pi is the area of a circle with radius of 1 (unit), and the circumference of a circle with a radius of ½ (unit).

A circle with a radius of 9.6 millimeters has a circumference of 60.32 millimeters.

Use the formulae for the area and circumference of a circle, replacing the symbol for the radius or the diameter with the known radius or diameter. As a reminder, the radius is 1/2 the diameter.Circumference = pi x diameter area = pi x radius squared

Divide its circumference by 2*pi which will give the radius of the circle. Area of the circle then is pi*radius squared

Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared

28.26=area 18.84=circumference

The radius of a circle is the distance from the centre of the circle to a point on the circumference of the circle. If it is a drawing and the circle is to scale the radius can be measured with a ruler. If not, the radius can be calculated if the diameter, circumference or area of the circle is known. the radius is equal to: - the diameter divided by 2 - the circumference divided by 2pi(approx. 6.284) - the square root of the area divided pi (divide by pi first, then take the square root)