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Verified answer
Bab Bangun DatarMatematika SMP Kelas VII
p = 3 + l
Persegi Panjang
Keliling = 54
2 . (p + l) = 54
3 + l + l = 54/2
2l = 27 - 3
l = 24/2
l = 12 cm
p = 3 + l
p = 3 + 12
p = 15 cm
Luas = p . l
Luas = 15 . 12
Luas = 180 cm²