Odpowiedź:
[tex]2. \: P = 60 {cm}^{2} \\ a = 12cm \\ h =? \\ ah = P \\ 12cm \times h = 60 {cm}^{2} \\ h = 60 {cm}^{2} \div 12cm \\ h = 5cm[/tex]
[tex]3. \: P = 36 {cm}^{2} \\ e = 9cm \\ f =? \\ \frac{ef}{2} = P \\ \frac{9cm \times f}{2} = 36 {cm}^{2} \\ 9cm \times f = {72cm}^{2} \\ f = 72 {cm}^{2} \div 9cm \\ f = 8cm[/tex]
