Hello, Educated!

Your diagram didn't show up, but I'll take a guess.

There are 2 cogs, connected together by a belt.

Find the length of the belt.

The large cog has a radius of 11cm. The small cog has a radius of 4cm.

The distance between the centres of the 2 cogs is 25cm.

I got . and .

These happen to be correct.

In the diagram, consider quadrilateral

. . Note that it has two right angles.

Code:

O *
| @ *
7 | * 25
| *
| *
Q * - - - - - - - - - * P
| 24 |
4 | | 4
| |
| |
B * - - - - - - - - - * Z
24

In right triangle

Also: .

and: .

Can you finish up?