4. Panjang sisi-sisi suatu persegi panjang diketahui (2x - 6) cm dan (x + 8) cm. Jika kelilingnya 28 cm, tentukan luas persegi panjang tersebut! Jawab:
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Penjelasan dengan langkah-langkah:
Rumus:
K = 2(p + l)
28 cm = 2(2x - 6) + (x + 8)
28/2 = 2x - 6 + x + 8
14 = 3x + 2
14 - 2 = 3x
12 = 3x
12/3 = x
4cm = x
PanJang = (2x - 6) = 2(4) - 6 = 8 - 6 = 2 cm
Lebar = (x + 8) = 4 + 8 = 12 cm
Dit = Luas =?
L = p × l
L = 2 × 12
L = 24 cm²
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