Answer: (a)- [tex]0.99\ \text{units}[/tex]
Step-by-step explanation:
Given
Central angle is [tex]57^{\circ}[/tex]
The radius of the unit circle is [tex]1\ \text{unit}[/tex]
Arc length is given by
[tex]\Rightarrow l=\dfrac{\theta}{360^{\circ}}\times 2\pi r[/tex]
Put the values
[tex]\Rightarrow l=\dfrac{57}{360}\times 2\pi \cdot1\\\\\Rightarrow l=0.99\ \text{units}[/tex]
