1. AB : BD = 3:1
AC : BD = 3:1 т.к. AB = AC
21 : 3 = 7 - BD
AB = 7+21 = 28 см
2.AC : BC = 3:2
BC = 7×2 = 14 см
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Answers & Comments
1. AB : BD = 3:1
AC : BD = 3:1 т.к. AB = AC
21 : 3 = 7 - BD
AB = 7+21 = 28 см
2.AC : BC = 3:2
BC = 7×2 = 14 см