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- The problem of proving circle in mathematics of grade three.
The problem of proving circle in mathematics of grade three.
1. if d is DF, the vertical foot of AC is f, and the triangle ABD is all equal to the triangle AFD, DF=DB, and AC is the tangent of circle D.
2. EBD of triangle is all equal to CFD of triangle, and AF=AB FC=EB.
AB+EB=AC
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