Question

The diameter of a circular glass lens is 8.7 centimeters. Paige uses the edge of the lens to trace a circle on a sheet of paper. What is the estimated circumference of the circle?

1. 13.659 centimeters
2. 27.318 centimeters
3. 54.636 centimeters
4. 237.6666 centimeters

Answer 1

You need to multiply 8.7 by 3.14.You should get 27.318

Answer 2

Answer: 2. 27.318 centimeters

Explanation:

We know that the circumference of a circle is given by :-

`C=\pi d`, where d is the diameter of the circle.

Now, the diameter of the given circle = 8.7 centimeters

Therefore, the circumference of the circle will be :-

`C=\pi 8.7`

Since, the estimated value of
`\pi=3.14`,

Therefore,
`C\approx(3.14) 8.7=27.318\ \text{centimeters}`

Hence, the estimated circumference = 27.318 centimeters.