Answer
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r = 7.5
C = 15π or 47.1239
A = 56.25π or 176.7146
↓Steps Explained:↓

A circle has diameter = 15
Calculate Area, Circumference, Radius, Diameter
Calculate radius (r):
d = 2r
Rearranging the equation, we get:
r = 7.5
Calculate circumference (C):
C = 2πr
C = 2π * 7.5
C = 15π or 47.1239
Calculate Area (A):
A = πr2
A = π * 7.52
A = 56.25π or 176.7146
Final Answers
r =
7.5C =
15π or
47.1239A =
56.25π or
176.7146Related Calculators:
Unit Circle |
Circle Equation |
Annulus h