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b=5h
72=2(5h+h)
h=6
b=30
p = 2b + 2a
y sabemos que b = 5a, entonces:
p = 2b + 2a
p = 2(5a) + 2a
p = 10a + 2a
p = 12a
72 = 12a
a = 72/12 = 6
la altura mide 6 cm
y la base:
b = 5a = 5*6 = 30 cn