Giving brainliest h e l p

Which statement justifies why angle ebc measures 90?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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?