Penjelasan dengan langkah-langkah:
panjang = 3 × l (lebar)
K = 2 × (p + l)
72 = 2 × ((3 × l) + l)
72 = 2 × (3l + l)
72 = 2 × 4l
72/2 = 4l
36 = 4l
36/4 = l
9 km = l
...
panjang = 3 × l = 3 × 9 = 27 km
Luas = p × l = 27 × 9 = 243 km² (A)
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Penjelasan dengan langkah-langkah:
panjang = 3 × l (lebar)
K = 2 × (p + l)
72 = 2 × ((3 × l) + l)
72 = 2 × (3l + l)
72 = 2 × 4l
72/2 = 4l
36 = 4l
36/4 = l
9 km = l
...
panjang = 3 × l = 3 × 9 = 27 km
...
Luas = p × l = 27 × 9 = 243 km² (A)