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