By Mansi Yadav

Verified by Ajay Kumar

A circular park has a radius of 8 cm, and a special garden area is designed as a sector with an area of 32π cm². Find the length of the curved boundary (arc) of this garden sector.

  1. 4π cm

  2. 6π cm

  3. 8π cm

  4. 10π cm

Answer: C

Solution

Solution: Sector area \(A=\frac12r^2\theta\), with θ in radians. Given \(32\pi=\frac12\times8^2\times\theta=32\theta\), so \(\theta=\pi\). Arc length \(s=r\theta=8\pi\) cm. Trick: For a sector, divide twice its area by \(r^2\) to obtain the angle in radians, then multiply the angle by the radius.

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