Answer
C = 8π or 25.1327
d = 8
A = 16π or 50.2655
↓Steps Explained:↓

A circle has radius = 4
Calculate Area, Circumference, Radius, Diameter
Calculate circumference (C):
C = 2πr
C = 2π * 4
C = 8π or 25.1327
Calculate diameter (d):
d = 2r
d = 2 * 4
d = 8
Calculate Area (A):
A = πr2
A = π * 42
A = 16π or 50.2655
Final Answers
C =
8π or
25.1327d =
8A =
16π or
50.2655Related Calculators:
Unit Circle |
Circle Equation |
Annulus