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(3x)² + 12² = (5x)²
9x² + 144 = 25x²
144 = 25x² - 9x²
144 = 16x²
x² = 144:16
x = √9
x = 3
JL = 5x
JL = 5×3
JL = 15 cm
2x =12
x =12/2
x =6
5x=5(6)
=30