What is the circumference (round to the nearest tenth) of a circle with radius 51.25 inches?

• circumference = 2pye r
• radius =31.25
• area = pye r*2
• 22/7*31.25*31.25= 321.9 , 321.85 , 322

To calculate circumference you can use either of the formula
C = πd or
C =2πr
Where
C = circumference
d = distance
r = radius
π = 3.14 (constant)
For this question, we will use the second formula
C = 2 * 3.14 * 51.25
C = 321.85
Round up to the nearest tenth we have = 321.9