Question 11
A rectangle is divided into four smaller rectangles with areas as shown in the diagram below. Find the value of A.
**Editorial note for this self-study exercise:** A is the numerical area in square centimeters of the lower-left small rectangle. The dividing segments extend straight across the whole outer rectangle as shown.
**Editorial note for this self-study exercise:** A is the numerical area in square centimeters of the lower-left small rectangle. The dividing segments extend straight across the whole outer rectangle as shown.