Table of Contents

- 1 What is the area of a 40 foot circle?
- 2 What is the area of a 42 foot circle?
- 3 What is the area of a half circle with a radius of 40 cm?
- 4 Is Radian equal to pi?
- 5 Why is pi 22 divided 7?
- 6 How do you find the circumference of a circle with the diameter?
- 7 When do you need to know the area of a circle?

## What is the area of a 40 foot circle?

139.667 square yards (yd²)

### What is the area of a 42 foot circle?

How many square feet is a 42 foot circle?

1,385.4 | square feet |
---|---|

199,504 | square inches |

153.94 | square yards |

0.031805 | acres |

128.71 | square meters |

#### What is the area of a half circle with a radius of 40 cm?

5.41102 square feet (ft²)

**What is the π?**

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.

**What is the diameter of a 42 circle?**

We are given the Circumference 42” . We must find the Diameter (d). Hence, form the equation first. Hence, Diameter of the Circle ≈13.4” .

## Is Radian equal to pi?

or, equivalently, 180∘=π radians. So one radian is equal to 180π degrees, which is approximately 57.3∘. Since many angles in degrees can be expressed as simple fractions of 180, we use π as a basic unit in radians and often express angles as fractions of π.

### Why is pi 22 divided 7?

It is known that pi is an irrational number which means that the digits after the decimal point are never-ending and being a non-terminating value. Therefore, 22/7 is used for everyday calculations. ‘π’ is not equal to the ratio of any two number, which makes it an irrational number.

#### How do you find the circumference of a circle with the diameter?

2 x radius

Circle/Diameter

What is the area of a circle with a DIAMETER of 40 feet (radius of 20 feet)? How big is a 40 foot circle? The area of a circle is pi times the square of its radius. The radius is half the diameter. The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.

**How to calculate the radius of a circle?**

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: Area of a circle = π * (d/2)2

**How is the circumference of a circle related to its diameter?**

The circumference of a circle is pi times its diameter. The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.

## When do you need to know the area of a circle?

Circles are used when planning athletic tracks, recreational areas, buildings, and roundabouts, so knowing their area is important in construction, landscaping, etc. The famous Ferris-wheel attraction is a circle, as are the wheels on your car or bike.