Answer
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r = 4.5
C = 9π or 28.2743
A = 20.25π or 63.6173
C = 9π or 28.2743
A = 20.25π or 63.6173
↓Steps Explained:↓
A circle has diameter = 9
Calculate Area, Circumference, Radius, Diameter
Calculate radius (r):
d = 2r
Rearranging the equation, we get:
| r = | d |
| 2 |
| r = | 9 |
| 2 |
r = 4.5
Calculate circumference (C):
C = 2πr
C = 2π * 4.5
C = 9π or 28.2743
Calculate Area (A):
A = πr2
A = π * 4.52
A = 20.25π or 63.6173
Final Answers
r = 4.5C = 9π or 28.2743
A = 20.25π or 63.6173
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Related Calculators: Unit Circle | Circle Equation | Annulus