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180 cm2 = (2x + 3) x 12
Panjang = 180 cm2 / 12 = 15 cm
Semoga membantu :)
P = 2x + 3
L = 12 cm
Luas = 180 cm²
Ditanya:
P = ??
Jawab:
Luas = P x L
180 = (2x + 3) x 12
180/12 = 2x + 3
15 = 2x + 3
15 - 3 = 2x
12 = 2x
x = 12/2
x = 6
Jadi, panjang persegi panjang adalah:
P = 2x + 3
P = 2(6) + 3
P = 12 + 3
P = 15 cm