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50 cm = base
área = b × alt / 2
200 dm = 2000 cm
base = 50 cm
2000 = 50 x alt / 2
4000/50 =alt
80 = alt
perimetro
teoría de pitagora
80² + 25²= x²
√7050= x
83.8 = x
perimetro = 83.8 + 83.8 + 50 = 217.6 ..