Question 255383
You have a right triangle with a base=3 & an hypotenuse=15.
Using a^2=b^2+c^2 formula & solving for b we get the hright.
3^2+b^2=15^2
9+b^2=225
b^2=225-9
b^2=216
b=sqrt216
b=14.697 ft. is the height.