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Verified answer
Bab Bangun DatarMatematika SMP Kelas VII
Persegi Panjang
p = l + 1
Keliling = 30
2 . (p + l) = 30
l + 1 + l = 30 : 2
2l = 15 - 1
l = 14 : 2
l = 7 cm
p = l + 1
p = 7 + 1
p = 8 cm
Luas = p . l
Luas = 8 . 7
Luas = 56 cm²
disubstitusikan ke :
K = 30
2x(p+l) = 30
2x(1+l+l) = 30
1+2l = 30:2
1+2l = 15
2l = 15-1
2l = 14
l = 14:2
l = 7 cm
maka,
p = 1+l
p = 1+7
p = 8 cm x 7 cm
p = 56 cm²
jadi,
L = p x l
L = 8 cm x