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which tool is not needed to construct a perpendicular bisector?

(a.) compass
(b.) pencil
(c.) protractor
(d.) straightedge

Answer :

Answer: C) Protractor

The use of straightedge and compass is needed, and so is a pencil (or any kind of writing tool). You don't need a protractor or any kind of measuring device (eg: ruler) when it comes to straightedge and compass constructions.
You would use a protractor to construct a perpendicular bisector. So your answer would be (c.)

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