Dimensional Analysis: Working with Exact Values of \(\pi\)
Dimensional Analysis: Working with Exact Values of \(\pi\)
Secondary 3
The diagram shows a sector of a circle with centre \(O\) and radius \(10\) cm.
\(P\) is the midpoint of \(OA\) and \(Q\) is a point on \(OB\) such that \(4QB=1OQ\).
Given that \(\angle AOB=0.5\) radians, calculate
- the length of the arc \(AB\),
- the length of the line \(PQ\).
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Answer:(i) \(5\text{ cm}\) (ii) \(4.34\text{ cm}\)
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