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In the figure, AB vert vert CD. If vert vert OE vert vert OF, find the value of x.

Mathematics

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Here's how to solve the problem:

Part (a): Find the value of xx.
Given: AB∥CDAB \parallel CD and OE⊥OFOE \perp OF.
This means ∠EOF=90∘\angle EOF = 90^\circ.

  1. Draw a line through OO parallel to ABAB and CDCD.

    Let this line be MNMN.
    Since MN∥ABMN \parallel AB, ∠AEO\angle AEO and ∠EOM\angle EOM are alternate interior angles.

    ∠EOM=∠AEO=50∘\angle EOM = \angle AEO = 50^\circ
  2. Since MN∥CDMN \parallel CD, ∠OFC\angle OFC and ∠FOM\angle FOM are alternate interior angles.

    ∠FOM=∠OFC=x\angle FOM = \angle OFC = x
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