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Circle
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Triangle
Radius
Unit
A triangle must satisfy the side-length rule before area can be calculated. The entered unit is used directly in results.
Area
78.54 cm²
Perimeter 31.42 cm
Copy result
Perimeter
31.42 cm
Diameter
10 cm
Formula
A = πr² · C = 2πr
Shape status
Valid
Quick presets
Circle r10
Rectangle 16:9
Triangle 3-4-5