Answers for 1-3 plsss

What is the length of bc ? enter your answer in the box. bc =

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?

The architect's side view drawing of a saltbox-style house shows a post that supports the roof ridge. the support post is 8 ft tall. the distance from the front of the house to the support post is less than the distance from the post to the back of the house. how far from the front of the house is the support post positioned?