So like how do I do this?

Step-by-step explanation:

The legs of the triangle have lengths 9 and 12.  The Pythagorean Theorem says .

Yes, these values make a Pythagorean Triple (3 integers that fit the Pythagorean Theorem)

There are infinitely many of these triples:  3,4,5   5,12,13 are examples.  The triple in this problem is 3 times the 3,4,5 triple.

.mp4 files, because, video

45

step-by-step explanation:

to find a percentage, add a decimal in front and multiply it by the other number.

.25 times 180= 45