alleryWhich is NOT allowed in a ruler-and-compass construction?
AJoining two given points
BDrawing an arc from a centre
CUsing marks on the ruler
DIntersecting two circles
Answer & Solution
Correct answer: C. Using marks on the ruler
1. Each construction must be mathematically exact.
2. Eyeballing distances or using marks on a ruler is not permitted.
3. Drawing arcs, joining points and intersecting circles are basic allowed moves.
_Source: Wikipedia, Straightedge and compass construction, section Straightedge and compass tools_
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