I.
[tex]e = 6 \ cm\\f = 4 \ cm\\\\P = \frac{e\cdot f}{2}\\\\P = \frac{6 \ cm\cdot4 \ cm}{2} = 12 \ cm^{2}[/tex]
II.
[tex]a = 5 \ cm\\h = 4 \ cm\\\\P = a\cdot h\\\\P = 5 \ cm\cdot4 \ cm = 20 \ cm^{2}[/tex]
III.
[tex]e = 3 \ cm\\f = 4 cm\\\\P = \frac{e\cdot f}{2}\\\\P = \frac{3 \ cm\cdot4 \ cm}{2} = 6 \ cm^{2}[/tex]
IV.
[tex]a = 3 \ cm\\h = 2 \ cm\\\\P = a\cdot h\\\\P = 3 \ cm\cdot2 \ cm= 6 \ cm^{2}[/tex]
