Find the arc length of the semi circle!! Please help me!! Click on the picture

This is easy bro,
So first, all you have to do is finding the half circumstance,
the formula for circumstance is:
C=π*d
since the diameter is 8, therefore,
C=π*8
C=8π,
using 3.14 for π,
8*3.14=
25.12
Hope this helps!!!!