Table of Contents

## What is circumference of 20 inch diameter circle?

125.6 inches

Circumference = 125.6 inches.

**How do you find the circumference with the diameter?**

2 x radius

Circle/Diameter

**What is the diameter of a 30 circumference?**

94.25 centimeters

Answer: The circumference of a circle with a diameter of 30 centimeters would be 94.25 centimeters. The diameter of a circle is given by joining any two points on the circle such that the line passes through the center. In other words, the diameter of a circle is twice its radius i.e., 2r.

### What is the area of a 28 diameter circle?

Diameter = 28 cm. Radius = D/2 = 14 cm. Hence the area of the given circle is 616 cm².

**How do I measure a diameter?**

Determine the diameter from the circumference by dividing the circumference by the value of pi, which is 3.141592. Pi is the ratio between the circumference and the diameter and when it is divided into the circumference the result is the diameter.

**How many inches are in a diameter?**

Divide the circumference by pi, approximately 3.14, to calculate the diameter of the circle. For example, if the circumference equals 56.52 inches, divide 56.52 by 3.14 to get a diameter of 18 inches. Multiply the radius by 2 to find the diameter.

#### What tool makes a perfect circle?

compass

A compass is the traditional tool for drawing precise circles, and its sharp point acts as a pivot.

**How do you figure out a diameter?**

How To Calculate Diameter?

- Diameter = Circumference ÷ π (when the circumference is given)
- Diameter = 2 × Radius (when the radius is given)
- Diameter = 2√[Area/π] (when the area is given)

**What is circumference of cylinder?**

How do I find the circumference of a cylinder? If you know the cylinder’s radius: Multiply the radius by 2 to get the diameter. Multiply the result by π, or 3.14 for an estimation. That’s it; you found the circumference of the cylinder.

## How do you calculate circumference using diameter?

To calculate circumference (C) from a circle’s diameter, multiply the diameter by π, or C = πd. To calculate circumference from a circle’s radius, multiply the radius by 2, and then multiply the result by π, or C = 2rπ.

**How do you find the diameter if you have the circumference?**

If you know the radius of the circle, multiply it by 2 to find the diameter. If the radius of a circle is 2.47 cm, the diameter is 2.47 cm * 2, which equals 4.94 cm. If you know the circumference of a circle you can divide it by pi (3.14) to get the diameter (circumference = pi * diameter).

**What is the formula for finding circumference?**

The circumference of a circle is calculated using the formula: 2 x π x radius, where π is a mathematical constant, equal to about 3.14159.

### What is circumference divided by diameter?

By definition, pi is the ratio of the circumference of a circle to its diameter. In other words, pi equals the circumference divided by the diameter (π = c/d). Conversely, the circumference of a circle is equal to pi times the diameter (c = πd).