The sum of the interior angles of a polygon is 3960 degrees. How many sides does the polygon have?

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

Which statement justifies why angle ebc measures 90?

Having a hard time understanding this question (see attachment).