Answer
C = 40π or 125.6637
d = 40
A = 400π or 1256.6371
↓Steps Explained:↓

A circle has radius = 20
Calculate Area, Circumference, Radius, Diameter
Calculate circumference (C):
C = 2πr
C = 2π * 20
C = 40π or 125.6637
Calculate diameter (d):
d = 2r
d = 2 * 20
d = 40
Calculate Area (A):
A = πr2
A = π * 202
A = 400π or 1256.6371
Final Answers
C =
40π or
125.6637d =
40A =
400π or
1256.6371Related Calculators:
Unit Circle |
Circle Equation |
Annulus