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28:4=7
7+2=9
7 cm ma krótszy bok a 9 dłuższy
7cm*9cm=63cm2 (63 centymetry kwadratowe)
a+a+a-2+a-2=32
4a-4=32
4a=32+4
4a=36 /:4
a=9
a-2=7
Boki prostokata aja dlugosc 7 i 9 cm.
P=a*b
P=9*7
P=63
a+a+2=16
2a=14
a=7
a+2=9
P=a•(a+2)=63