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ABIs parallel to CD, and EFis perpendicular to AB.
The number of 90° angles formed by the intersections of EFand the two parallel lines ABand CDis

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Answer:

  8

Step-by-step explanation:

The four angles formed at each intersection of lines are all 90°.

The total number of 90° angles at the two intersections is 2×4 = 8 90° angles.

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