问题
填空题
已知线段AB为圆O的弦,且AB=2,则
|
答案
取AB的中点C则OC⊥AB且AB=2AC,
•AO
=AB
•2AO
=2AC
•AO
=2(AC
+AC
)•CO
=2AC
2+AC
•CO
=2 AC
2=2AC
故答案为2
已知线段AB为圆O的弦,且AB=2,则
|
取AB的中点C则OC⊥AB且AB=2AC,
•AO
=AB
•2AO
=2AC
•AO
=2(AC
+AC
)•CO
=2AC
2+AC
•CO
=2 AC
2=2AC
故答案为2