alleryTo bisect AB, draw circles at A and B with what radius?
AExactly half of AB
BEqual, under half of AB
CDifferent, under AB
DEqual, over half of AB
Answer & Solution
Correct answer: D. Equal, over half of AB
1. Use the same radius r for both circles, centred at A and at B.
2. The radius must be greater than half of AB so the circles cross.
3. The line through the two crossing points is the perpendicular bisector.
_Source: Wikipedia, Bisection, section Construction by straightedge and compass_
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