Circumference formula: d x pi.
8 = d.
So 8 x pi hot 3.14 in this case) = circumference = 8pi or 25.12
Because this is to find the semicircle it is 8pi/2 or 25.12/2.
=
4pi or 12.56.
This is because the arc of the semicircle is half of the full circle.
Answer: 4pi or 12.56