The diagram shows the floor plan of an L-shaped room. The overall length of the room is 12 m and the overall width is 8 m. A rectangular corner measuring 5 m by 3 m has been cut away, with its edges parallel to the sides of the room. Work out the perimeter of the room.
Figure (to be drawn): An L-shaped hexagon formed from a 12 m by 8 m rectangle with a 5 m by 3 m rectangle removed from the top-right corner. Label the bottom edge 12 m and the left edge 8 m. On the notch, label the short horizontal edge 5 m and the short vertical edge 3 m. Leave the remaining top edge and remaining right-hand edge unlabelled, since the student must calculate them.
(Total for Question 12 is 3 marks)