Answer:
a = 1.57 in
Step-by-step explanation:
We know that the length of the arc in a circle is proportional to its corresponding angle which means:
a corresponds to 45
2πr corresponds to 360
then
[tex]\frac{a}{45} = \frac{2\pi r}{360}[/tex]
then
a = (45÷360)×4×π
=1.570796326795
