[tex]P_{p}[/tex] = 6cm * 12cm = 72 [tex]cm^{2}[/tex]
[tex]P_{t}[/tex] = [tex]\frac{14 * 12}{2}[/tex] = 168cm/2 = 84 [tex]cm^{2}[/tex]
P = 72 [tex]cm^{2}[/tex] + 84[tex]cm^{2}[/tex] = 156 [tex]cm^{2}[/tex]
[tex]P_{p}[/tex] - pole prostokąta
[tex]P_{t}[/tex] - pole trójkąta