Find the area of a trapezoid im so lost

You will get 25 points an image of a rectangular prism is shown below: part a: a cross section of the prism is cut with a plane parallel to the base. what is the name of the shape created by the cross section? explain your answer. (5 points) part b: if a cross section of the prism is cut perpendicular to the base, what would be the shape of the resulting cross section? explain your answer. (5 points)

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

What is the range for 31,39,29,34,37,24,36,33,34,28