Final answer:
Pascal's theorem can be applied to prove the congruence of triangles DMO and DEMO.
Explanation:
Theorem 21, Pascal's theorem , can be used to prove the triangles DMO and DEMO are congruent.
Pascal's theorem states that certain lines determined by the vertices of a hexagon inscribed in a conic intersect at points lying on a straight line. In this case, the configuration of the lines aligns with the properties of triangles DMO and DEMO, showing their congruence.
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