Best Answer

If circumference(C) is given, then r = C/2(pi)

If area(A) is given, then r = (A/pi)1/2

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Q: How do you determine the radius if you know the area and the circumference of a circle?

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

You would need to include the radius to be able to determine the area.

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

They would have to give you enough information to eventually get the diameter. If they gave you the area of a circle and asked for the circumference, you can determine the radius, and from the radius the diameter, and then the circumference. If they said "What is the circumference if the area of a circle is 36pi?" Area of a circle is pi*r2, which would give us a value for r = 6 Diameter is 2*r, or = 12. Circumference is d*pi, or 12pi

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.

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