## How does pi relate to the area of a circle?

The area of a circle is pi times the radius squared (A = π r²). Learn how to use this formula to find the area of a circle when given the diameter.

## What is pi and how does it relate to a circle?

Succinctly, pi—which is written as the Greek letter for p, or π—is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle’s size, this ratio will always equal pi. In decimal form, the value of pi is approximately 3.14.

How is pi related to area and circumference?

The Formula In math, we have a formula that relates these two parts of a circle. This formula is called the circumference formula, and it is C = pi*d where C stands for the circumference and d stands for the diameter. And pi is pi or 3.14.

### Why do you use pi in finding area?

Hint: Pi (π) is the ratio of the circumference of a circle to its diameter. It doesn’t matter how big or small the circle is – the ratio stays the same. Properties like this that stay the same when you change other attributes are called constants.

### How is pi used in real life?

In basic mathematics, Pi is used to find area and circumference of a circle. You might not use it yourself every day, but Pi is used in most calculations for building and construction, quantum physics, communications, music theory, medical procedures, air travel, and space flight, to name a few.

What is pi in circle?

Circles are all similar, and “the circumference divided by the diameter” produces the same value regardless of their radius. This value is the ratio of the circumference of a circle to its diameter and is called π (Pi).

#### Why is 3.14 so important?

It’s the ratio of the circumference of a circle to its diameter—a number just a little bit bigger than three. The constant π helps us understand our universe with greater clarity.

#### Why is pi important in math?

In basic mathematics, pi is used to find the area and circumference of a circle. Pi can be used to find an area by multiplying the radius of the circle squared times pi. So, to find the area of a circle with a radius of 3 centimeters, the calculation would be π3^2 = 28.27 cm.