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25² = (4x)² + (3x)²
625 = 16x² + 9x²
625 = 25x²
x² = 25
x = 5
panjang sisinya
4(x) = 4(5)
= 20 cm
3(x) = 3(5)
= 15 cm
Keliling = a + b + c
= 15 + 20 + 25
= 60 cm