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14) C
15) B
11) B
10)C
12) B
18.
32=12*2+2b
b(krótszy bok)
32=24+2b
32-24=2b
8=2b
b=4
odp. krotszy bok wynosi 4 .
19.
P=121
Obw.=?
P=4a
121=4a/4
a=30, 25cm - bok kwadratu
Obw= a+a+a+a
Obw= 30,25+30,25+30,25+30,25=
Obw = 121.