[tex]a \ cm\\\\b = (100\%-40\%)a = 60\%a = 0,6a \ cm\\\\h = 2b = 2\cdot0,6a = \underline{1,2a \ cm}\\\\\\P = \frac{a+b}{2}\cdot h = \frac{a+0,6a}{2}\cdot1,2a = (a+0,6a)\cdot0,6a = 1,6a\cdot 0,6a = \underline{0,96a^{2} \ cm^{2}}[/tex]
I. FAŁSZ
II. PRAWDA
