a)
[tex] \frac{e \times f}{2} = \frac{2 \times 15 + 2 \times 16}{2} = \frac{30 + 32}{2} = \frac{62}{2} = 31 {cm}^{2} [/tex]
b)
[tex]a \times h = 6.5 \times 23.1 = 150.15 {cm}^{2} [/tex]
c)
[tex] \frac{(a + b) \times h}{2} = \frac{(17 + 11) \times 4}{2} = \frac{28 \times 4}{2} = 14 \times 4 = 56 {cm}^{2} [/tex]
Myślę że pomogłem ;)
