Answer with explanation:
Circumference of circle =2 π r, where r is radius of circle.
If total length , that is thread or any wire used for constructing this circle is l, then
l=2 π r
If, length of circle =1 unit
[tex]1 \text{unit}=\frac{l}{2*\pi*r}\\\\ \text{For Distance around an unmarked circle=s}=\frac{sl}{2*\pi*r}[/tex]
If central angle is given=Ф , then
⇒Length of segment=Radius of circle(r) × Central Angle (Ф), where Ф, is in radians.
[tex]\text{Length of segment}=\frac{\pi*\o*r }{180^{\circ}}[/tex]
