alleryA length can be constructed only if it uses the four operations and what else?
ALogarithms
BCube roots
CSquare roots
DFifth roots
Answer & Solution
Correct answer: C. Square roots
1. Constructible numbers use +, -, times and divide.
2. They also allow square roots, but no higher-order roots.
3. This is why cube roots (doubling the cube) fail.
_Source: Wikipedia, Straightedge and compass construction, lead section_
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