alleryWhich angle is easy to trisect with ruler and compass?
AEvery angle
BA 60 degree angle
CA 20 degree angle
DA right angle
Answer & Solution
Correct answer: D. A right angle
1. A right angle split in three gives 30 degrees.
2. A 30-60-90 triangle can be constructed, so the 30 degree angle is available.
3. A 60 degree angle needs 20 degrees, which is not constructible.
_Source: Wikipedia, Angle trisection, lead section_
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