Answer
r = 6.5
C = 13π or 40.8407
A = 42.25π or 132.7323
↓Steps Explained:↓

A circle has diameter = 13
Calculate Area, Circumference, Radius, Diameter
Calculate radius (r):
d = 2r
Rearranging the equation, we get:
r = 6.5
Calculate circumference (C):
C = 2πr
C = 2π * 6.5
C = 13π or 40.8407
Calculate Area (A):
A = πr2
A = π * 6.52
A = 42.25π or 132.7323
Final Answers
r =
6.5C =
13π or
40.8407A =
42.25π or
132.7323Related Calculators:
Unit Circle |
Circle Equation |
Annulus h