How do you find the area with the radius?

The area of a circle is pi times the radius squared (A = π r²).

How do you find the area of a part of a circle?

The formula for sector area is simple – multiply the central angle by the radius squared, and divide by 2: Sector Area = r² * α / 2.

How do you convert radius to area of a circle?

To find the area using the radius, or the length from the center of the circle to the edge, use the formula area = πr^2, where r is the radius. For example, if the radius of the circle is 6 inches, first you would square 6 and get 36. Then, you would multiply 36 by π and get 113.04.

How do you find area with circumference and radius?

To find the area of a circle from the circumference, follow these steps:

  1. Divide the circumference by π.
  2. Divide the result by 2 to get the circle’s radius.
  3. Multiply the radius by itself to get its square.
  4. Multiply the square by π, or 3.14 for an estimation.
  5. You found the circle’s area from the circumference.

How do you calculate the area?

To work out the area of a square or rectangle, multiply its height by its width. If the height and width are in cm, the area is shown in cm². If the height and width are in m, the area is shown in m². A square with sides of 5 m has an area of 25 m², because 5 × 5 = 25.

How do you find the radius of a circle?

Radius of a circle from area: if you know the area A , the radius is r = √(A / π) . Radius of a circle from circumference: if you know the circumference c , the radius is r = c / (2 * π) . Radius of a circle from diameter: if you know the diameter d , the radius is r = d / 2 .

What is radius in a circle?

Definition of radius a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter. the length of such a line.

How do you find the area of a circle?

Area of a circle = π * r 2 Area of a circle diameter. The diameter of a circle calculator uses the following equation: Area of a circle = π * (d/2) 2

How do you find the radius of three different circles?

Let’s use these formulas to solve for the radius of three different circles, starting with the area of a circle formula. Let’s take the square root of a circle with a given area of 12 and divided by pi to determine the radius:

What units are used to find the area of a radius?

If you know the radius, r r, in whatever measurement units (mm, cm, m, inches, feet, and so on), use the formula π r 2 to find area, A A: The answer will be square units of the linear units, such as mm2 m m 2, cm2 c m 2, m2 m 2, square inches, square feet, and so on.

How do you calculate the diameter of a circle?

Diameter = 2 * Radius Area of a circle radius. The radius of a circle calculator uses the following area of a circle formula: Area of a circle = π * r 2