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When will the mathematical modeling of Inner Mongolia University begin?
1) Proof: Mn ‖ BC ∴∠ OEC = ∠ BCE ∠ CE ∠ BCA ∴∠ BCE = ∠ ACE.

∴∠ECO=∠OEC ∴OE=OC in the same way =OC ∴EO=FO.

(2) When the O point moves to the AC midpoint, the quadrilateral AECF is rectangular.

Prove; It is easy to prove that ∠ ECF = 90 OE = of OA = oc ∴ quadrilateral AECF is a parallelogram.

∴ parallelogram AECF is a rectangle.

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