# What is area of 40 mm circle?

## What is area of 40 mm circle?

The area of a circle is equal to π⋅r2 . If your diameter is 40m, then your radius must be 20m, as the radius of a circle is always half of the diameter. With this equation, you need to multiply π by 202 . Since 202=400 , your equation will be π⋅400 , or π400 .

What diameter is 40 circle?

1 Answer. The diameter is 12.74.

### What is the circumference of 40 m diameter?

As diameter is double the radius, if diameter is 40 meters, radius of circle is 20 meters. Hence circumference of circle is 2×3.1416×20=125.664 meters and area is 3.1416×20×20=1256.64 square meters.

How do you determine the size of a circle?

Just divide the circumference by π to find the diameter. For example, if your circle has a circumference of 23 inches, the diameter would be 23/π, or approximately 7.32 inches. If you only know the area of the circle, use the formula diameter = 2 x √(area/π).

#### What’s A diameter of A circle?

What is a diameter of a circle?

## Is circle a circumference?

The circumference of a circle is defined as the linear distance around it. In other words, if a circle is opened to form a straight line, then the length of that line will be the circle’s circumference.

Is 40mm the same as 1 inch?

The fraction inches are rounded to 1/64 resolution….Millimeters to inches conversion table.

Millimeters (mm) Inches (“) (decimal) Inches (“) (fraction)
40 mm 1.5784 ″ 1 37/64 ″
50 mm 1.9685 ″ 1 31/32 ″
60 mm 2.3622 ″ 2 23/64 ″
70 mm 2.7559 ″ 2 3/4 ″

### Where is the diameter of a circle?

Essentially, the diameter is twice the radius, as the largest distance between two points on a circle has to be a line segment through the center of a circle. The circumference of a circle can be defined as the distance around the circle, or the length of a circuit along the circle.

Is diameter a length or width?

Diameter is the length of a line touching two points on a circle that passes through the center. Diameter exists only for circular, or for circle-based objects like a sphere or cylinder, thus the width and length should always be the same.