alleryAn arc's length depends on the angle it subtends at the:
ACorner
BBorder
CChords
DCentre
Answer & Solution
Correct answer: D. Centre
1. A quarter circle takes 90 degrees of the full turn.
2. A semicircle takes 180 of the 360 degrees.
3. So the arc length depends on the angle at the centre.
4. The answer is the centre.
_Source: syllabus Mathematics, Ch 6 'Measuring Space: Perimeter and Area'_
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