O=28cm
a-1.bok-10cm
b=40%a=0,4a=4cm
o=2a+2b
O=2a+2*0,4a=2,8a
2,8a=28/:2,8
a=10cm
P=a*b
P=10*4=40cm2
a - 1 bok prostokąta
b - 2 bok prostokąta
2a+2b = 28
a = 0,4b
0,8b +2b = 28
stąd
2,8b = 28
b= 10cm
a=0,4b
a=0,4 * 10 = 4cm
sprawdźmy
2*4cm + 2*10cm = 8cm+20cm = 28cm
i
4cm = 0,4*10cm stąd L=P
P= a * b = 4cm *10cm = 40cm^2
Odp. Szukane pole wynosci 40 cm^2
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O=28cm
a-1.bok-10cm
b=40%a=0,4a=4cm
o=2a+2b
O=2a+2*0,4a=2,8a
2,8a=28/:2,8
a=10cm
P=a*b
P=10*4=40cm2
a - 1 bok prostokąta
b - 2 bok prostokąta
2a+2b = 28
a = 0,4b
0,8b +2b = 28
stąd
2,8b = 28
b= 10cm
a=0,4b
a=0,4 * 10 = 4cm
sprawdźmy
2*4cm + 2*10cm = 8cm+20cm = 28cm
i
4cm = 0,4*10cm stąd L=P
P= a * b = 4cm *10cm = 40cm^2
Odp. Szukane pole wynosci 40 cm^2