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a - długosc podstawy
O - obwód trójkąta
O = 36,4 cm
O = a + 2b
a = (100-20)% z b
a = 80% z b
a = 0,8b
O = 0,8b + 2b
36,4 = 2,8b |:2,8
b = 13 cm
a = 0,8b = 0,8*13 = 10,4 cm
Podstawa ma długość 10,4 cm a ramiona po 13 cm