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100² = (3a)² + (4a)²
100² = 9a² + 16a²
25a² = 100²
a² = (100 × 100) / 25
a² = 400
a = 20
p = 3 × 20 = 60 cm
l = 4 × 20 = 80 cm
K = 2(p + l)
K = 2(60 + 80)
K = 2(140)
K = 280 cm
L = p × l
L = 60 × 80
L = 4.800 cm²
Semoga berguna +_+