5.
a)
[tex] \frac{8 \times 14}{2} = 4 \times 14 = 56 {cm}^{2} [/tex]
b)
[tex]10 \times 4.8 = 48 {cm}^{2} [/tex]
c)
[tex] \frac{(14 + 6) \times 0,6}{2} = \frac{20 \times 0,6}{2} = 10 \times 0,6 = 6 {dm}^{2} [/tex]
6.
a)
[tex] \frac{13 \times 9}{2} = \frac{117}{2} = 58.5 {cm}^{2} [/tex]
b)
[tex] \frac{12 \times 9}{2} = 6 \times 9 = 54 {cm}^{2} [/tex]
