An arc of the length 16\(\pi\)cm subtends an angle of 80o at the centre of the circle. Find the radius of the circle.
- 24cm
- 28cm
-
36cm
- 32cm
The correct answer is: C
Explanation
L = \(\frac{\theta}{360}\) x 2\(\pi\)r16\(\pi\) = \(\frac{80}{360}\) x 2\(\pi\)r
\(\frac{16\pi \times 360}{80 \times 2\pi}\) = r
r = 36cm
There is an explanation video available .