Obliczenia:
- Obwód prostokąta o bokach 6 cm i 3 cm.
Ob = 2*a + 2*b
Ob =2*6cm + 2*3cm = 12cm + 6cm = 18cm
- Pole prostokąta o bokach 6 cm i 3 cm.
P = a * b
P = 6cm * 3cm = [tex]18cm^2[/tex]
- Obwód prostokąta o bokach 2m i 14m
Ob = 2*a + 2*b
Ob = 2*2m + 2*14m = 4m + 28m = 32m
- Pole prostokąta o bokach 2m i 14m
P = a * b
P = 2m * 14m = [tex]28m^2[/tex]
- Obliczamy bok prostokąta - b
Ob = 2*a + 2*b
28 dm = 2*9dm + 2*b
28dm = 18dm + 2b
28dm - 18dm = 2b
10dm = 2b
2b = 10dm /:2
b = 5dm
- Pole prostokąta o bokach 9dm i 5dm
P = a * b
P = 9dm * 5dm = [tex]45dm^2[/tex]
- Obliczamy bok prostokąta - a
P = a * b
[tex]32mm^2[/tex] = a * 4mm /:4
8mm = a
a = 8mm
- Obliczamy pole prostokąta o bokach 8mm i 4mm
Ob = 2*a + 2*b
Ob = 2*8mm + 2*4mm = 16mm + 8mm = 24mm
- Obliczamy bok prostokąta - b
Ob = 2*a + 2*b
114dm = 2*50dm + 2*b
114dm = 100dm + 2b
114dm - 100dm = 2b
14dm = 2b
2b = 14dm /:2
b = 7dm
- Pole prostokąta o bokach 50 dm i 7dm
P = a * b
P = 50dm * 7dm = [tex]350dm^2[/tex]
