Question 11
The diagram shows how a regular pentagon $ABCDE$ may be constructed by tying a knot in a rectangular piece of paper. If the dimensions of the original rectangle is 17.2 cm by 2.5 cm, and $CN+DP=CD$, what is the area, in $\mathrm{cm}^2$, of the quadrilateral $ACDE$?
Figure (1):
Figure (2):
Figure (1):
Figure (2):