In the pythagorean theorem what does the b stand for

Acar travels at an average speed of 56 miles per hour. how long does it take to travel 196 miles

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Eis the midpoint of line segment ac and bd also line segment ed is congruent to ec prove that line segment ae is congruent to line segment be