chiều cao hình thang là
\(\frac{11.3x2}{13.7+8.9}\)=1 dm
đáy lớn sau khi tăng là
13.7 + 4.5=18.2 dm
diện tích hình thang lúc sau là:
\(\frac{\left(18.2+8.9\right)x1}{2}\)=13.55 dm\(^2\)
diện tích tăng thêm
13.55-11.3=2.25 dm2
ĐS
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