# 9  Top surface of a raised platform is in the shape of a regular octagon as shown in the figure. Find the area of the octagonal surface.

Area of octagonal surface = Area of rectangular surface + 2(Area of trapezium surface)

Area of recatangular surface =

Area of trapezium surface =

So total area of octagonal surface = 55 + 2(32) = 55 + 64 = 119

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