# How to measure the circumference of a circle

Eratosthenes was the first person who measures the circumference of Earth. He was a Greek mathematician, in 240 B.C. He discovered that objects in a city on the Northern Tropic don’t throw a shadow at noon on the summer solstice, but they do in a more northerly location. By knowing this and the length between the locations, he succeeded in measuring the Earth's circumference. The distance between the two cities was measured by Eratosthenes to be 800 kilometers. He multiplied 800 kilometers by 50 to arrive at a figure of 40,000 kilometers for the Earth's diameter.

Even though the circumference of the circle is its length, it cannot be measured using a scale like other shapes like squares, triangles and rectangles can the rationale for this is the circle's bent shape.

The strategies below can be used to measure the circumference of a circle

Method 1. We would use this thread to trace the course of the circle and designate the places on the trend a common Ruler can be used to check the thread length later. Study the possibility when we are given a circular plate with a circumference of a circle.

Step 1. Using the method described above, we could now take a thread and wrap it towards the circular plate.

Step 2. Next, on the thread, make a starting and ending point.

Step 3. Finally, using the perimeter measurement, measure the length of the thread from start to finish point.

Method 2. Measuring the circumference of a circle is an accurate way to calculate it in geometry. As a result, we apply a formula that involves the radius, diameter of a circle, and the value of Pi(π) to determine the circumference of a circle. To the beginning, if we are given the radius and circumference must be computed, the steps to follow are as follows:

If the radius of any random circle is 7 cm, we may determine the circumference using the following steps:

Step 1. Check over the data which have been provided to us; in this case, the radius has been provided.

Step 2. Use the following formula

C=2πr

Here C = circumferences, r= radius, and π=22/7.

Step 3. We obtain the desired outcomes by substituting values in the formula

Step 4:

C=2π r=2 22/7 7=44cm

Similarly, if the diameter is specified, we can follow the procedure below:

Example: If the diameter of circular CD is given as 14cm and the circumference is required, the following is the solution:

Step 1. Check the given information, in this case, diameter is given.

Step 2.Use the following formula

C=π d

(Here, C denotes circumference, d denotes diameter, and π=22/7 or 3.14)

Step 3.We get the required result by substituting the values in the formula.

C=π =22/7 14=44cm

## What is the circumference of a circle

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## Circumference of a circle formula

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## What is the formula for the circumference of a circle

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## How to find the circumference of a circle

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## How to calculate the circumference of a circle

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## How to get the circumference of a circle

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## How to find circumference of a circle with diameter

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## Circumference of a circle with diameter

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## Radius of a circle from circumference

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## How to find the area and circumference of a circle

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## Examples about circumference of a circle

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