The figure below shows a quadrilateral ABCD with sides a, b, c, and d. The incircles of triangles ABC and ADC are tangent to AC at E, and F, respectively. Prove that EF = (b + d - a - c)/2.
Geometry Problems
1301-1310
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Open Problems
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Quadrilateral
Triangle
Circle
Incircle
Tangent Line
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