Using 3.14 to approximate , find the area of the shaded region.
Find the area of the shape below using as an approximation for . Round your answer to two decimal places.
Noah wants to paint one of the walls in his house; it is a rectangular wall with dimensions as seen in the given figure. He does not need to paint the door and will buy a gallon tin of paint that covers 400 square feet of wall. Work out what fraction of the tin will remain after he has painted the wall.