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dłuzszy ma 15
spr:. 10x2+15x2=50
Obw = 2a+2b
2a+2b = 50
a = b+5
2(b+5)+2b= 50
a = b+5
2b+10+2b = 50
a = b+5
4b = 50-10
a = b+5
4b = 40 /:4
a = b+5
b=10
a = 10+5
b=10
a=15
Mają boki długości 10 i 15 cm.