Wzór na pole trójkąta:
[tex]P = \frac{1}{2}ah[/tex]
a)
[tex]a = 3 \ cm\\h = 4 \ cm\\\\P = \frac{1}{2}ah = \frac{1}{2}\cdot3\cdot4=\boxed{6 \ cm^{2}}[/tex]
b)
[tex]a = 4 \ cm\\h = 2 \ cm\\\\P = \frac{1}{2}ah = \frac{1}{2}\cdot4\cdot2 = \boxed{4 \ cm^{2}}[/tex]
c)
[tex]a = 2 \ cm\\h = 2,5 \ cm\\\\P = \frac{1}{2}ah = \frac{1}{2}\cdot2\cdot2,5 = \boxed{2,5 \ cm^{2}}[/tex]
