Obwód = 2a + 2b
24cm = 2*8cm + 2b
24cm = 16cm + 2b
24cm - 16cm = 2b
2b = 8cm /:2
b = 4cm
P = a * b
P = 8cm * 4cm
P = 32[tex]cm^2[/tex]
[tex]8 * \frac{1}{10} = \frac{8}{10} = 0,8[/tex]
8cm + 0,8cm = 8,8cm
P = 4cm * 8,8cm
P = 35,2[tex]cm^2[/tex]
35,2[tex]cm^2[/tex] - 32[tex]cm^2[/tex] = 3,2[tex]cm^2[/tex]