Question

Top surface of a raised platform is in the shape of a rectangular octagon as shown in the figure. Find the area of the octagon surface.

Answer 1

Area of rectangle $=11\times 5=55$ sq. metre
Area of trapezium $=\frac{1}{2}\times 4\times 16=32$ sq. metre
Total area $=2\times 32+55=119$ sq. metre