Question 5
An old static CCTV camera, which can only move horizontally, covers the area shown in the figure below. If the distance from the CCTV camera to the ends of the wall are 20 m and 30 m, respectively, what is the total area, in $\mathrm{m}^2$, that is covered by the CCTV camera?
(If the answer is in the form of $a\sqrt b$ where b is the smallest non-square number, write the answer in the form $a;b$)
(If the answer is in the form of $a\sqrt b$ where b is the smallest non-square number, write the answer in the form $a;b$)