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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 circumference of a circle with a radius of 5 centimeters 157.0796...The area of a circle with a radius of a 5 centimeters is 78.5398...

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

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

28.26=area 18.84=circumference

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).

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

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

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