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Bab AljabarMatematika SMP Kelas VII
Persegi panjang
1] keliling = 2 . (p + l)
keliling = 2 . (3x - 2 + x + 5)
keliling = 2 (4x + 3)
keliling = (8x + 6) cm
2] keliling = 62
8x + 6 = 62
8x = 62 - 6
x = 56/8
x = 7
3] p = 3x - 2
p = 3 . 7 - 2
p = 19 cm
l = x + 5
l = 7 + 5
l = 12 cm