∆ABC~∆A1B1C1, <C= <C1, <A= <A1 => B1C1/BC=A1C1/AC
21/28=18/x
x=28*18/21=4*6=24
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∆ABC~∆A1B1C1, <C= <C1, <A= <A1 => B1C1/BC=A1C1/AC
21/28=18/x
x=28*18/21=4*6=24