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  1. www.omnicalculator.com › math › area-of-a-circleArea of a Circle Calculator

    3 dni temu · The formula to calculate the area of a circle using radius is as follows: Area of a circle = π × r2. And, to calculate the area of a circle using diameter use the following equation: Area of a circle = π × (d/2)2. where: π is approximately equal to 3.14.

  2. www.gigacalculator.com › calculators › area-of-circle-calculatorArea of a Circle Calculator

    Example: find the area of a circle. Task 1: Given the radius of a circle, find its area. For example, if the radius is 5 inches, then using the first area formula calculate π x 5 2 = 3.14159 x 25 = 78.54 sq in.

  3. www.mathsisfun.com › geometry › circle-areaArea of a Circle - Math is Fun

    Calculator. Enter the radius, diameter, circumference or area of a Circle to find the other three. The calculations are done "live": How to Calculate the Area. The area of a circle is: π ( Pi) times the Radius squared: A = π r2. or, when you know the Diameter: A = (π/4) × D2. or, when you know the Circumference: A = C2 / 4π.

  4. www.math-salamanders.com › area-of-a-circleArea of a Circle - Math Salamanders

    The formula for the area of a circle is: A = πr2, where r is the radius of the circle. To find the area of a circle, follow these simple steps: find the radius of the circle (the distance from one side to the center of the circle). It is the same as half of the diameter of the circle. square the radius (multiply the radius by itself)

  5. www.chilimath.com › lessons › geometry-lessonsArea of Circle - Definition, Formula & Examples | ChiliMath

    Understand that you can easily determine the area of a circle using the formula Area = π × r^2, where π is approximately 3.14, and r represents the radius of the circle. Note that radius is half the diameter of a circle.

  6. www.omnicalculator.com › math › circumference-area-circleCircumference and Area of a Circle Calculator

    22 lip 2024 · Use the formulas to calculate the circumference and area: c = 2πr and A = πr². The circumference should equal c = 2π × 8 cm = 50.265 cm. The area should equal A = π × (8 cm)² = 201.06 cm². To check your results, input the 8 cm radius in the calculator. The results should also be 50.265 cm and 201.06 cm².

  7. www.math.net › area-of-a-circleArea of a circle - Math.net

    The area of a circle can be found using the following formula: A = πr 2 where A is area, r is radius, and π is the mathematical constant approximately equal to 3.14159.