Question 2
A rectangular piece of paper is folded as shown below. If the area of the shaded part is 50cm², find the perimeter of the rectangular piece of paper when it is unfolded.
**Editorial note for this self-study exercise:** For this self-study exercise, assume the unlabelled rectangular flap hanging below the shaded triangle is a square. This extra condition is needed because its height is not marked in the source. Enter the perimeter in centimeters.
**Editorial note for this self-study exercise:** For this self-study exercise, assume the unlabelled rectangular flap hanging below the shaded triangle is a square. This extra condition is needed because its height is not marked in the source. Enter the perimeter in centimeters.