Table of Contents

- 1 How many square inches are in a 12 inch diameter circle?
- 2 How many square inches are in a circle?
- 3 How many square inches are in a 9 inch diameter circle?
- 4 What is the circumference of a 12 inch diameter?
- 5 What is the circumference of 14 diameter?
- 6 How many square inches are in an 18 inch diameter?
- 7 How do you convert square inches to diameter?

## How many square inches are in a 12 inch diameter circle?

113 square inches

To find the area of a circle, you need to use the formula A=π⋅r2 ; therefore the area A is π⋅62≈113 square inches.

### How many square inches are in a circle?

Multiply it by itself, then multiply it by the mathematical constant pi (3.1415926…) to determine the square inches within the circle. So, a circle with a radius of 4 inches would have an area of 50.27 square inches, as this is the product of 3.14 x 16.

#### How many square inches are in a 9 inch diameter circle?

9 inch = 64 square inches.

**What’s the circumference of a 10 inch circle?**

31.42cm

We know that C = πd. Since the diameter is 10cm, we know that C = π x 10cm = 31.42cm (to 2 decimal places).

**How do you figure the diameter of something?**

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 the circumference of a 12 inch diameter?

To find the circumference of a circle, you will use the formula C=2⋅π⋅r ; therefore the circumference C is 2⋅π⋅6≈38 inches.

### What is the circumference of 14 diameter?

Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm .

#### How many square inches are in an 18 inch diameter?

324 square inches

For example, if you have a 18 inch radius, you would multiply 18 inches by 18 inches to get 324 square inches.

**How many inches is 1 square inch?**

A “square inch” is a unit of area measurement equal to a square measuring one inch on each side. 1 Square Inch = 0.00064516 square meters. Abbrev.: in2, sq.in., SqIn.

**What is the area of a 9 diameter circle?**

Hence, the area of a circle if the diameter is 9 cm is 63.62cm2.

## How do you convert square inches to diameter?

Calculate the Diameter of a Circle, from Its Area

- Divide the area (in square units) by Pi (approximately 3.14159). Example: 303,000/3.14159 = 96447.98.
- Take the square root of the result (Example: 310.56). This is the radius.
- Now double the radius to get the diameter (Example: 621.12 meters).