P trapezu= [tex]\frac{(a+b) * h}{2}[/tex]
Zad 7
12 - 6 = 6
6 : 2 = 3
[tex]a^{2}[/tex] + [tex]3^{2}[/tex] = [tex]4^{2}[/tex]
16 - 9 = [tex]a^{2}[/tex]
[tex]a^{2}[/tex] = [tex]7[/tex]
a = [tex]\sqrt{7}[/tex] = h
[tex]\frac{(6+12) * \sqrt{7}}{2}[/tex] = [tex]\frac{18 \sqrt{7}}{2}[/tex] = [tex]9\sqrt{7}[/tex] = P trapezu
Zad 8
7 cm + 9 cm = 16 cm
16 * 7 = 112
[tex]\frac{(7+9)*112}{2}[/tex] = [tex]\frac{1792}{2}[/tex] = 896 = P trapezu
