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0,25=25/100=1/4
0,1(1)=(11-1)/90=10/90=1/9
A/6=C/4=D/9=k
A=6k
C=4k
D=9k
A+C+D=360°-75°=285°
6k+4k+9k=285°
19k=285°
k=15°
A=6k=6×15°=90°
C=4k=4×15°=60°
D=9k=9×15°=135°