a)
W okienku: 8cm
Pole
[tex] \frac{(a + b) \times h}{2} = \frac{(5 + 8) \times 4}{2} = \frac{ 13 \times 4}{2} = 13 \times 2 = 26 {cm}^{2} [/tex]
b)
W okienku: 5,5cm
Pole
[tex] \frac{(2.5 + 5.5) \times 3}{2} = \frac{8 \times 3}{2} = 4 \times 3 = 12 {cm}^{2} [/tex]
c)
W okienku: 3cm
Pole
[tex] \frac{(7 + 3) \times 4}{2} = \frac{10 \times 4}{2} = 10 \times 2 = 20 {cm}^{2} [/tex]
