alleryAn angle is constructible only if which of its values is a constructible number?
AIts complement
BIts degree count
CIts supplement
DIts cosine
Answer & Solution
Correct answer: D. Its cosine
1. An angle is constructible if and only if its cosine is a constructible number.
2. Equivalently its sine or tangent can be used.
3. The plain degree count by itself does not decide it.
_Source: Wikipedia, Straightedge and compass construction, lead section_
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