How to find the circumference of a circle with a rectangle inside and a perpendicular line?

Rewrite so the subject can be y in the formula d=m-y/y+n

Aflagpole broke in a storm. it was originally 8 1 81 feet tall. 2 8 28 feet are still sticking straight out of the ground, where it snapped, but the remaining piece has hinged over and touches the ground some distance away. how far away is the end of the pole from the base of the pole along the ground?

What is the point slope form of a line with slope -5 that contains point (2,-1)