Question

Use string to measure the distance across each circle. How many of these lengths does it take to go completely around the circle?

Answer 1

The answer is 3.14 times

EXPLANATION :

The circumference formula of a circle is :

`C=\pi D`

where D is the distance across the circle or called Diameter.

Pi is approximately equal to 3.14

and C is the distance around the circle.

In order to fully cover around the circle by the diameter, you need to multiply it by 3.14.

For example, if you measured 10 cm for the diameter, you need 3.14 times of this length to cover around the circle.

To check this,

3.14 times the diameter (10 cm) :

3.14 x 10 = 31.4

This must be the same if you solve the circumference of the circle given the formula above.

Using the formula above :

`\begin{gathered} C=\pi D \\ C=3.14*10 \\ C=31.4 \end{gathered}`

Since they are equal, the number of lengths you need is 3.14 times