tanah pak sudi berbentuk persegi panjang. Keliling tanah 40 m, panjang dan lebar nya berbanding 5:3. Hitung luas tanah pak sudi ?
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perbandingan p : l = 5:3
K=2(p + l)
40=2(p + l)
(p + l)=40/2
=20
maka, L=(p + l)^2/2
= 20^2/2
=400/2
=200cm^2