a) Równoległobok:
P = a · h
a = 12 cm
h = 8 cm
[tex]P = 12 \ cm * 8 \ cm = 96 \ cm[/tex]
b) Trapez:
[tex]P = \frac{(a+b)*h}{2}[/tex]
a = 9 dm
b = 7 dm
h = 4 dm
[tex]P = \frac{(9 \ dm \ + \ 7 \ dm) \ * \ 4 \ dm}{2} = \frac{16 \ dm \ * \ 4 \ dm}{2} = \frac{64 \ dm}{2} = 32 \ dm[/tex]
c) Romb:
[tex]P = \frac{e*f}{2}[/tex]
e = 7 m
f = 13 m
[tex]P = \frac{7 \ m \ * \ 13 \ m}{2} = \frac{9 \ m}{2} = 45,5 \ m[/tex]
d) Romb:
[tex]P=\frac{e*f}{2}[/tex]
e = 5 cm
f = 9 cm
[tex]P = \frac{5 \ cm \ * \ 9 \ cm}{2} = \frac{45 \ cm}{2} = 22,5 \ cm[/tex]
e) Trapez:
[tex]P = \frac{(a+b)*h}{2}[/tex]
a = 4,5 dm
b = 9,5 dm
h = 6 dm
[tex]P = \frac{(4,5 \ dm \ + \ 9,5 \ dm) \ * \ 6 \ dm}{2} = \frac{14 \ dm \ * \ 6 \ dm}{2} = \frac{84 \ dm}{2} = 42 \ dm\\[/tex]
Mam nadzieję, że pomogłam ;)
Pozdrawiam
