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38=2a+2(a+5)
38=2a+2a+10
28=4a /:4
a=7
b=12
P=7*12
P=84
x=7
x+5=12
P=7*12=84cm2
a = 5+ b
czyli z tego mozesz wyliczyc sobie b
2b + 10 + 2b = 38
4b = 28
b = 7
a= 12
zatem pole = 7* 12 = 84
mam nadzieje ze pomoglem ;]