Circumference = 56.52
Length of the darkened part of the arc = 3.6π
Solution:
Radius of the circle = 9
Circumference of the circle = 2πr
= 2 × π × 9
Circumference of the circle = 18π
Equal number of parts = 5
Total degree of circle = 360°
Degree of the darkened part = [tex]\frac{360^\circ}{5}= 72^\circ[/tex]
[tex]$\text {Arc length}=18 \pi \left(\frac{\theta}{360^\circ}\right)[/tex]
[tex]$=18 \pi\left(\frac{72^\circ}{360^\circ}\right)[/tex]
= 3.6π
Circumference = 18π
Length of the darkened part of the arc = 3.6π
