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b - bok dłuższy
2(a+b) = 24cm
a+b = 12cm
a * 4cm = b * 2cm
2a = b
a + 2a = 12cm
a = 4cm
P = a * 4cm = 16cm²
Odp: Jego pole wynosi 16cm².
ob=a+b+c+d
a=2cm
b=4cm
24cm-6cm=18cm
18cm÷2=9cm
c=9cm
d=9cm
p=(a+b)×h÷2
p=6cm×9m÷2
p=18cm²