# The Chemistry Teacher decides to use chalk paint to cover a circular portion of a wall in the science lab. If the greatest distance across the circle is 4 feet, approximately how big around is the circle?

Join The Chemistry Teacher's experiment with chalk paint on a circular portion of the lab wall. Calculate the circumference of the circle, given its greatest diameter of 4 feet!

by Maivizhi A

**Updated **Mar 06, 2024

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## The Chemistry Teacher decides to use chalk paint to cover a circular portion of a wall in the science lab. If the greatest distance across the circle is 4 feet, approximately how big around is the circle?

The circumference of the circle is 12.56 feet.

The greatest distance across a circle, which passes through its center, is called the diameter.

Given that the diameter of the circular portion of the wall is 4 feet, we can use the formula for the circumference of a circle to find its size around.

The formula for the circumference of a circle is:

Circumference = π * Diameter

Given that the diameter is 4 feet, we can substitute it into the formula:

Circumference = π * 4 feet

Now, we need to approximate the value of π. π is approximately equal to 3.14.

Circumference ≈ 3.14 * 4 feet ≈ 12.56 feet

So, approximately, the circumference of the circle is 12.56 feet.

## Circles and Circumference

Circles are fundamental geometric shapes defined as a set of points in a plane that are equidistant from a fixed point, called the center. The distance from the center to any point on the circle is called the radius. The circumference of a circle is the perimeter or the distance around the circle.

The formula to calculate the circumference of a circle is:

Circumference (C) = 2 * π * r

Where:

C is the circumference

π (pi) is a mathematical constant approximately equal to 3.14159

r is the radius of the circle

Alternatively, if you know the diameter (d) of the circle, you can also find the circumference using this formula:

Circumference (C) = π * d

Remember, π is a constant that is approximately equal to 3.14159, but you can use more digits for greater precision if needed

## The Chemistry Teacher decides to use chalk paint to cover a circular portion of a wall in the science lab. If the greatest distance across the circle is 4 feet, approximately how big around is the circle - FAQs

### 1. What is the diameter of a circle?

The diameter of a circle is the greatest distance across the circle, passing through its center.

### 2. What is the circumference of a circle?

The circumference of a circle is the perimeter or the distance around the circle.

### 3. What formula can we use to find the circumference of a circle?

The formula for the circumference of a circle is: Circumference (C) = 2 * π * r (where π is approximately 3.14159 and r is the radius).

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