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Nửa chu vi của cái sân hình chữ nhật là:
\(180:2=90\) (cm)
Ta có sơ đồ:
Chiều dài I----------I----------I----------I----------I
Tổng: 90cm
Chiều rộng I----------I
Chiều dài của cái sân hình chữ nhật là:
\(90:\left(4+1\right)\cdot4=72\) (cm)
Chiều rộng của cái sân hình chữ nhật là:
\(90-72=18\) (cm)
Diện tích của cái sân hình chữ nhật đó là:
\(72\cdot18=1296\) (cm2)
Đáp số: 1296 cm2
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