Area of a circle is presented in this interactive lesson from Math Goodies. ... In the
last lesson, we learned that the formula for circumference of a circle is: C ...
The area of a circle is pi times the radius squared (A = π r²). Learn how to use this
formula to find the area of a circle when given the diameter.
Given the radius, use this area of a circle calculator to find the area for any circle.
This calculator will calculate the area of a circle given its radius.
Six Methods:Calculate Area ExamplesSample CalculatorArea of the Circle
Finding the Area of a SectorSpecial circlesMeasuring the Diameter of Round
Calculate the area, circumference, raius or diameter of a circle with step-by-step
Area of a circle, formula for area explained with examples, pictures, interactive
examples and quiz.
Definitions and formulas for the arc and the arc length of a circle, sector and the
area of the sector of a circle, the unit circle, the angles on the unit circle in ...
: circle graphic. Area = circle graphic where r = the radius of the circle and pi =
3.141592... red line.
This free online geometry calculator will take one known circle measurement (
area, circumference, diameter, or radius) and calculate the other three. Plus,