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II bok- x
d- x+3
z tw Pitagorasa
9²+x²=(x+3)²
81+x²=x²+6x+9
-6x=-72
x=12- II bok
d=x+3=12+3=15cm
P=9×12=108cm²
Obwod- 2×9+2×12=18+24=42cm