The proportion would be 180/x=60/x
You would use Pythagorean theorem to help u out if u have 2 sides u should be able to do it.
They are parallel to eachother
Factor out 18.
The factors for 18 are as listed:
1, 2, 3, 6, 9, 18
Now factor out 30.
The factors for 30 are as listed:
1, 2, 3, 5, 6, 10, 15, 30
Now look at the factors that are both factors for 18 and 30.
So, the common factors are 2, 3, and 6.