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26:2=13
drug bok ma 13 cm długości:)
a = 7 cm
obw = 2a + 2b
40 = 2*7 + 2b
40 = 14 + 2b / - 14
26 = 2b / podzielić na 2
b = 13
wzór na obw. prostokąta= a+b+a+b
a=7cm
b=?
7cm+7cm=14cm
40cm-14cm=26cm
26cm/2=13cm
Odp.: Drugi bok ma 13cm.