/_ A=30°/_B=90-30=60°->HCB=90-60=30°/_DCB =90/2=45
Тогда /_DCH=DCB-HCB=45-30=15°
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/_ A=30°/_B=90-30=60°->HCB=90-60=30°/_DCB =90/2=45
Тогда /_DCH=DCB-HCB=45-30=15°