Answer:
1. C =9.106 cm        2.C =49.612 inches
Step-by-step explanation:
To solve these problems, we will follow the steps below;
First write down the formula for calculating the circumference of the circle
C= 2Ï€r
where c is the circumference of the circle   and r is the radius of the circle
1) From the question diameter = 2.9 cm, but radius is half of the diameter, this implies that radius = [tex]\frac{d}{2}[/tex]= [tex]\frac{2.9}{2}[/tex]=1.45 cm Â
We can now proceed to insert the values into the formula;
C= 2Ï€r
  = 2×3.14×1.45
  =9.106 cm
C =9.106 cm
2) From the question, radius = 7.9 inches and π=3.14
We can now go ahead to insert the values into the formula  C= 2πr
C = 2×3.14× 7.9
  =49.612 inches
C =49.612 inches
