Wysokość
[tex]20 - 100\% \\ x - 130\% \\ \\ x = \frac{20 \times 130}{100} = \frac{1 \times 130}{5} = 26cm[/tex]
Druga podstawa
[tex]20 - 100\% \\ x - 90\% \\ \\ x = \frac{20 \times 90}{100} = 2 \times 9 = 18cm[/tex]
Pole
[tex] \frac{(a + b) \times h}{2} = \frac{(20 + 18) \times 26}{2} = \frac{38 \times 26}{2} = 19 \times 26 = \boxed{494 {cm}^{2} }[/tex]
