АВ/AC=cos30°; AC=AB/cos30°; AC=21:(√3/2)=2·21/√3=(2·21·√3)/(√3·√3)=14√3
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АВ/AC=cos30°; AC=AB/cos30°; AC=21:(√3/2)=2·21/√3=(2·21·√3)/(√3·√3)=14√3