alleryTrisecting which angle would need an unbuildable 20 degree angle?
A90 degrees
B135 degrees
C60 degrees
D45 degrees
Answer & Solution
Correct answer: C. 60 degrees
1. Trisecting 60 degrees would need a 20 degree angle.
2. That angle cannot be constructed with ruler and compass.
3. A right angle (90) and 135 degrees can be trisected easily.
_Source: Wikipedia, Straightedge and compass construction, section Angle trisection_
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