find the area of a regular octagon abcdefgh having each side equal to 5cm hc=11cm and al is parallel to hc such that al =4cm
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40 cm2
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Quadrilateral ABCH is a trapezoid: area = (1/2)(4)(11 + 5) = 32 cm²
Quadrilateral HCDG is a rectangle: area = (5)*(11) = 55 cm²
Quadrilateral EFGD is a trapezoid congruent to trapezoid ABCH: area = 32 cm²
Area of regular octagon ABCDEFGH is: (32) + (32) + (55) = 119 cm²
QED
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