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omnicalculator.com
https://www.omnicalculator.com/math/area-of-a-circ…
Area of a Circle Calculator
The area of a circle calculator will compute the surface of a circle using a radius or a diameter.
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mathsisfun.com
https://www.mathsisfun.com/geometry/circle-area.ht…
Area of a Circle - Math is Fun
See How to Calculate the Area below, but first the calculator: Enter the radius, diameter, circumference or area of a Circle to find the other three.
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calculatorsoup.com
https://www.calculatorsoup.com/calculators/geometr…
Circle Calculator
Use this circle calculator to find the area, circumference, radius or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns.
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wikihow.com
https://www.wikihow.com/Calculate-the-Area-of-a-Ci…
5 Ways to Calculate the Area of a Circle - wikiHow
To find the area of a circle, use the formula A = π • r2, where r is the radius of the circle. If you only know the diameter of the circle, then use the formula A = π • (d/2)2 where d is diameter.
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calculateme.com
https://www.calculateme.com/shape-area/circle/
Calculate the Area of a Circle
This calculator will calculate the area of a circle given its diameter, using the famous formula area = pi times (d/2) squared. It supports different units such as meters, feet, and inches. Just type into the box and hit the calculate button.
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calculator.plus
https://calculator.plus/circle-area-calculator
Circle Area Calculator
This calculator determines the area of a circle using either the radius or the diameter. You may also enter a custom value for π, or use the default value of 3.14159.
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sagecalculator.com
https://sagecalculator.com/diameter-to-area-calcul…
Diameter To Area Calculator - Sage Calculator
Need to know the area of a circle using just its diameter? Use our Diameter to Area Calculator to get fast, accurate results for all your circular measurement needs.
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alfacalculator.com
https://alfacalculator.com/circle-area-calculator/
Free Circle Area Calculator: Find Area Using Radius, Diameter, or ...
Calculate the area of any circle easily with our free online tool. Input radius, diameter, or circumference to get instant, accurate results with step-by-step explanations and visual representation..
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claydesk.ai
https://claydesk.ai/calculators/conversion/circle-…
Circle Area Calculator | Calculate Area from Diameter or Radius
Calculate using either radius or diameter measurements in various units including centimeters, inches, meters, and more. Choose your preferred decimal precision and π (pi) approximation level for tailored results. Get area, radius, diameter, and circumference calculations with the formula used displayed for learning.
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cuemath.com
https://www.cuemath.com/questions/how-to-find-the-…
How to find the area of a circle using diameter [solved] - Cuemath
Answer: The area of a circle using diameter can be found by the formula, Area = 1/4πd 2, where 'd' is the diameter of the circle and 'π' (pi) is a constant with a value of 22/7 or 3.14