如图，点ABC在$⊙c$上,$⊙c1$与$⊙c$内切于$T$,与$AB$,$AC$分别切于点$F$,$E$.延长$TF$交$⊙c$于另一点$D$.连$DA$,$DC$.求证:$DA^2=DC^2=DT•DE$

5338368B-1A59-4B0D-B230-F993BF3D5A12.png

DFR:3.7

SCR:30

Solution of Prob.3