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55m2
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Answer:
The answer is 119 cm².
As, divide the octagon into
a reactangle and 2 trapeziums .
Now, Area of rectangle = L× B= 11×5=55cm²
Area of 2 trapeziums=2× 1/2×(S1+S2)×H
= 2 × 1/2×(11+5) × 4
= 64 cm²
So,area of octagon= 64 + 55
= 119cm²
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