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|A`B`|=8cm
|B`C`|=6cm
|A`C`|=7cm
Obw=8cm+6cm+7cm
Obw=21cm
k=21/28|A`B`|/|AB|
21/28=8/x
21x=224/21
x=10,6
|AB|=10,6cm
k=|B`C`|/|BC|
21/28=6/x
21x=168/21
x=8
k=|A`C`|/|AC|
21/28=7/x
21x=196/21
x=9,3|AC|