a)
[tex] \frac{a \times h}{2} = \frac{2cm \times 3cm}{2} = \frac{6 {cm}^{2} }{2} = 3 {cm}^{2} [/tex]
b)
[tex] \frac{a \times h}{2} = \frac{3cm \times 4cm}{2} = \frac{12 {cm}^{2} }{2} = 6 {cm}^{2} [/tex]
c)
[tex] \frac{a \times h}{2} = \frac{2.6cm \times 3.5cm}{2} = \frac{9.1 {cm}^{2} }{2} = 4.55 {cm}^{2} [/tex]
