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Bab Bangun DatarMatematika SMP Kelas VII
a] persegi panjang
keliling = 2 . (p + l)
keliling = 2 . (5x + 1 + 3x)
keliling = 2 . (8x + 1)
keliling = 16x + 2
b] Trapesium
keliling = jumlah seluruh sisi
keliling = 2x + 2y + 4 + 4x + 1 + 3y
keliling = 6x + 5y + 4