Spike's Calculators

# Changing a Circle to a Square

Its like magic to change a circle into a square, click the button and poof there you have it!!

This calculator converts the area of a circle into a square with four even length sides and four right angles. The calculation is based on the area of the square being the same as the circle's area. ### Circle Formula's

`R = D ÷ 2`
where R = radius, D = diameter

Area;
`A = π * D² ÷ 4`
where A = area, π = 3.14159..., D = diameter

Circumference;
`C = 2 * π * D ÷ 2`
where C = circumference, π = 3.14159...., D = diameter

### Square Formula's

Area
`Area = length * length`

The square side length (calculated from the circle's area)
`side length = √ (A)`
where A = the area of the circle

Perimeter
`perimeter = length * 4`

### Circle to Square

Select unit:
diameter of the circle {{selectedunit.m1}}
decimal rounding # of digits in results

#### Results:

 circle's radius {{selectedunit.m1}} area of the circle {{selectedunit.m1}}² circumference of the circle {{selectedunit.m1}} side length of the square {{selectedunit.m1}} perimeter of the the square {{selectedunit.m1}}

#### Calculation

1. enter the diameter of a circle
2. number of decimal places required in results

#### Results

2. the area of the circle
3. the perimeter of the circle (circumference)
4. side of the square's length
5. perimeter of the square