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l = √20² - 12²
l = √400 - 144
l = √256
l = 16 cm
L = p × l
L = 12 × 16
L = 192 cm²
12² + x² = 20²
144 + x² = 400
x² = 400 - 144
x² = 256
x = √256
x = 16
luas persegi panjang adalah
12 x 16 = 192 cm²