Question

Top surface of a raised platform is in the shape of a regular octagon as shown in
the figure 14.12. Find the area enclosed by octagonal figure.​

Answer 1

Answer:

Step-by-step explanation:

AREA enclosed by the OCTAGON

= AREA OF ABCH + DEFG + CDGH

= [1/2(5+11)4] + [1/2(5+11)4] + (5x11)

= 32 + 32 + 55

= 119m²

AREA OF TRAPEZIUM

= 1/2(sum of parallel sides)(altitude)

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Answer 2

Step-by-step explanation:

area of ABCH + DEFG + CDGH

= [1/2(5+11)4] + [1/2(5+11)4] + (5 × 11)

= 32 + 32 + 55

= 119m^2

area of trapezium

= 1/2(sum of parallel side) altitude