the top surface of a raised platform, as shown as in the figure, is in the shape of a regular octagon of side 5 cm. what is the area of the octagonal surface.
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abhinashrana96:
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first find area of two triangles
Bh=6×3.5/2=21/2
Bh=6×3.5/2=21/2
area of rest rectangle = 5×6 = 30
21/2+21/2+30 = 51
as we know its regularoctagon so we
multiply 51 by 4
=204
now need to subract adictive area we calculated earlier =21×3=63
=204-63
=141 is your answer
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