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b- drugi bok
równanie z klamerką
¾= a/b
2a+2b=42 |: 2
_____
4a= 3b
a+b= 21
___
4a= 3b
a= 21 - b
_____
4(21-b) = 3b
a= 21 - b
_____
84-4b= 3b
a= 21 - b
_____
84= 7b|: 7
a= 21 - b
____
12=b
a= 21-12
____
12=b
9=a
d- przekątna
^ - do kwadratu
12^ + 9^ = d^
144 + 81= d^
225= d^
15= D