圆形区域计算器
从半径计算一个圆的面积.
Circle Area Calculator
Calculate area of a circle from its radius.
Calculate circle area instantly from radius or diameter. Geometry made simple.
Características Principales
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Calculate area from radius
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Calculate area from diameter
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Calculate circumference
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Show calculation steps
How to Use Circle Area Calculator
1
Enter Radius or Diameter
Input the circle radius or diameter
2
Calculate
Click calculate to find the area
3
View Results
See area, circumference, and diameter
Casos de Uso
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Calculate circular area for landscapes
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Engineering measurements
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Cake and pizza sizing
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Geometry education
Preguntas Frecuentes
What is the formula for circle area?
Area = π × r² where r is the radius
What is pi?
Pi (π) is approximately 3.14159, the ratio of circumference to diameter.
How do I find radius from diameter?
Radius = Diameter / 2
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