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By using the other information supplied about the circle to calculate either its radius (from which its area can be calculated) or its area (if the circle is similar to another with a given area and some ratio between the two circle is given):

  • If the diameter is given: radius = diameter ÷ 2
  • If the circumference is given: radius = circumference ÷ 2π
  • If the circle is similar to another circle which has a given area, and the length ratio is given; square the length ratio to get the area ratio and apply to the given area.
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∙ 6y ago
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∙ 6y ago

The answer may depend on what other information you have about the circle.

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Q: How do you find the area of a circle when the radius is unknown?
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Related questions

When radius is unknown then how to find area of a circle?

By dividing its diameter by 2 is equal to the radius of a circle and its area is pi*radius2


How do you find ratio of area to radius?

In a circle, the area of the circle is pi times the radius squared


What is the radius and the area of a circle?

The radius of a circle is the distance from the center to any point on the circle. The area is the space within the circle. The formula to find the area is πr2. r stands for the radius of the circle. If you want to find the radius, you can work backwards from the area or the circumference, which is the perimeter of the circle. The formula for circumference is 2πr.


How do you find the radius of circle with area 144pi?

Equation for the area circle = pi x radius squared If the area is 144pi, then you need to find the square root of 144, which is 12. Therefore, radius = 12


Why do you find the area of a circle with pi times the radius squared?

You find the area of a circle with pi times radius squared because the radius is half the circle so to find the full area you need to multiply it again.


What is the radius of a circle if the area is 153.86cm2?

The area of a circle is 153.86cm².find the radius of the circle


How do you find the radius of an inscribed circle of a square given the area of the circle?

If yo have the area of the circle, the square is irrelevant. Radius = sqrt(Area/pi)


How to find area of a circle?

you take the radius and multiply it by itself. then you multiply the radius squared by 3.14 to get the area of a circle...


How do you find a area a circle?

The answer depends on what information you are given.


How do you find the radius and diameter of the circle if you know the area?

Area of Circle = pi (radius)2 So , using this formula we can find the radius and also the diameter. Diameter = 2(radius)


When you know the radius of a circle how can you find the area?

Area of a circle = pi*radius2


How do you find the area of a circle by only knowing the radius?

Since the area of a circle is pi times radius squared, take the radius and square it. Then, multiply that by 3.14, or pi to get the area of the circle.