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= (5x * 3x)
= 15x²
15x² = 735
x² = 735 / 15
x² = 49
x = √49
x = 7 cm
panjang = 7 * 5 = 35 cm
lebar = 7 * 3 = 21 cm
keliling = 2 (p + l)
= 2 (35 + 21)
= 2 (56)
= 112 cm