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a² + b² = c²
(3x)² + (4x)² = 50²
9x² + 16x² = 2500
25x² = 2500
x² = 2500/25
x² = 100
x = √100 = 10
jadi nilai x = 10
2) luas = a x t / 2
= 10 x 13 / 2
= 65 cm²