Answer:
The ladder is 15 feet long
Explanation:
Use Pythagorean theorem
SO the base is 9ft so that is a
THe height is 12 which is B
We just need hypotenuse since we got 2 legs already and cause it said “how long”.
so put it in a^2+b^2=c^2
9^2+12^2=c^2
81+144=c^2
225=c^2
now solve for c
√225=15
SO the ladder is 15 feet long