Question

Find the area of the shaded region in the following figure, where $ABCD$ is rectangle and all the corners are right angled.

Answer 1

Area of shaded region $=(120\times 3)+(3\times 90)+(3\times 90)-(3\times 3)-(3\times 3)$

$=360+270+270-18$

$=900-18=882{cm}^2$