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a cm - dłuższa podstawa
40% to 4/10
a - 4/10a = 6/10a = 3/5a cm - krótsza podstawa
2 * 3/5a = 6/5a cm - wysokość
pole trapezu = (a + 3/5a) * 6/5a / 2 = 8/5a * 3/5a = 24/25a² cm²