# Thread: [SOLVED] Question regarding length

1. ## [SOLVED] Question regarding length

Solved, thanks.

2. Originally Posted by Pegasus15
Hello,

Bit stuck with a question here. It says:

"A taut belt keeps 4 discs in position, as shown. If Radius = 14cm, and taking pie = 22/7, find the length of the belt."

There is also a diagram that kinda looks like this:

OO
OO

Where O = a disc and there's also a line around the discs.

Many thanks.
The four discs are at the corners of a square and the belt is looped tight around it?

-Dan

3. Originally Posted by topsquark
The four discs are at the corners of a square and the belt is looped tight around it?

-Dan
They aren't at the corner of a square, no, but it is looped tight around it.

Many thanks for the quick reply!

4. Originally Posted by Pegasus15
I've attached an image of the diagram. It might be of help.
First, sketch the square formed by the centers of the discs. Then note that the straight portions of the belt are equal in length to the corresponding sides of the square. So the sum of the straight portions of the belt is equal to the perimeter of the square.

Also note that there are 4 curved portions of the belt and each of them are 1/4 of the circumference of a disc....

-Dan

5. I'm not sure that I get what you mean, sorry.

Could you try and explain it again, please? I think I get the bit about the corners being a 1/4 of the circumference of a circle.

When you say sketch the square, do you mean mark the center of each circle and join up?

EDIT: I get it now. Thank you very much! It's very appreciated!