# What is the area of circle with a radius of 3 ft?

A circle of radius = 3 or diameter = 6 or circumference = 18.85 feet has an area of: 2.62637E-6 square kilometers (km²) 2.62637 square meters (m²)

What is the radius of a circle calculator? The radius of a circle calculator uses the following area of a circle formula: Area of a circle = π × r2. Area of a circle diameter. The diameter of a circle calculator uses the following equation: π is approximately equal to 3.14.

What is the formula for area 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. Area of a circle diameter. The diameter of a circle calculator uses the following equation: Area of a circle = π * (d/2) 2. Where: π is approximately equal to 3.14.

How do you find the diameter of a circle? You can find the diameter of a circle by multiplying the radius of a circle by two: 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 × r2. Area of a circle diameter. The diameter of a circle calculator uses the following equation:

What is the difference between radius and circumference? Circumference is the linear distance around the circle edge. The radius of a circle is any of the line segments from its center to its perimeter. The radius is half the diameter or r = d2. The diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

## What is the radius of a circle calculator?

How do you calculate radius of a circle? Method 2 Method 2 of 4: Using the Area

• Set up the formula for the area of a circle.
• Plug the area into the formula. Use this formula to find the radius when the problem tells you the area of the circle.
• If your calculator allows you to enter the whole formula on one line, that will give you a more accurate answer.
• Take the square root.
• How do you solve the radius of a circle? Observe the following formulas to calculate the radius:

• When the diameter is known, the formula for the radius of a circle is: Radius = Diameter / 2
• When the circumference is known, the formula for the radius is: Radius = Circumference / 2π
• When the area is known, the formula for the radius is: Radius = ⎷ (Area of the circle / π)

How to find the radius of a circle on a graph? follow these steps:

• Realize that the circle is centered at the origin (no h and v) and place this point there.
• Calculate the radius by solving for r. Set r -squared = 16.
• Plot the radius points on the coordinate plane. You count out 4 in every direction from the center (0, 0): left, right, up, and down.
• Connect the dots to graph the circle using a smooth, round curve.

What is the formula for finding the area of a circle? The formula for the area of a circle is A = πr 2, where r is the radius of the circle. The unit of area is the square unit, for example, m 2, cm 2, in 2, etc. Area of Circle = πr2 or πd2/4 in square units, where (Pi) π = 22/7 or 3.14. Pi (π) is the ratio of circumference to diameter of any circle.