Sarthaks Test
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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.

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Side of regular octagon = 5 cm

Area of trapezium ABCH = Area of trapezium DEFG

Area pf tra[ezium ABCD 

Area of rectangle HGDC = 11 × 5 = 55 m2

Area of octagon = Area of trapezium ABCH + Area of trapezium DEFG + Area of rectangle HGDC

= 32 m2 + 32 m2 + 55 m2 = 119 m2

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