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Given:

Prove:

Three lines BE, AD, and CF are intersected at the midpoint point O.

Complete the proof.

Suppose that
. By the vertical angles theorem,
and
. By the transitive property,
, and
, which contradicts the given. Therefore,
.

Given Prove Three lines BE AD and CF are intersected at the midpoint point O Complete the proof Suppose that By the vertical angles theorem and By the transitiv class=

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