If r=1 and 0 = 7pi/4 what is the approximate arc length?

In this case, we'll have to carry out several steps to find the solution.
Step 01:
data:
r = 1
θ = 7π / 4
Step 02:
arc length:
[tex]arc\text{ length =}\theta\text{ r = }\frac{7\pi}{4}*1=\text{ 5.498}[/tex]The answer is:
arc length = 5.498 units