АВСD =АС +SBC=СВА
SA=√/3см
АВ=1см
AD=3cm
SB=5cm
AC=7cn
SD=18cm
SBC=9cm
SDC=13cm
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АВСD =АС +SBC=СВА
SA=√/3см
АВ=1см
AD=3cm
SB=5cm
AC=7cn
SD=18cm
SBC=9cm
SDC=13cm