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2*radius=diametre radius=2.1 Area=pi*(radius)^2 Area=3.1428*2.1*2.1 Area=13.86

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Q: How do you find the area of a circle that has a diameter of 4. 2?
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How do I figure the area of a circle by diameter?

To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)


How do you find the area of a semi-circle if you know the diameter?

A semicircle is 1/2 of a circle. Find the area with the diameter you are given as if you had a whole circle, then divide that answer by 2 to get the area of the semicircle.


How do you find the radius and diameter of the circle if you know the area?

Area of Circle = pi (radius)2 So , using this formula we can find the radius and also the diameter. Diameter = 2(radius)


What is the formula to find the area of a circle with the diameter in it?

Area = Pi(d/2)2 where d = diameter


How do you find the area of a circle using its diameter?

The area of a circle is pi(radius)2 Radius is half the diameter. Simply divide the diameter in half and enter it into the equation 3.14(diameter/2)2


How do you find the diameter of a circle in the terms of pi?

To find the diameter of a circle, you will either need to know the area or its circumference. If you know the area: diameter = 2 x squareroot(area / Pi) If you know the circumference diameter = circumference / Pi


Equation to find the area of a circle?

Area of a circle = (pi) (R2)R = radius of the circle = 1/2 of its diameter


How do you find area if you know the diameter?

radius = diameter/2 area of a circle in square units = pi*radius2


Find diameter when you only have area of a circle?

pi*radius2 = area of a circle radius2 = area/pi radius = square root of (area/pi) diameter = 2*radius


How do you find the diameter when given the area?

depends greatly on the thing you are working with. assuming a circle with area A the diameter is 2*sqrt(A*pi) since A =r*r*pi and diameter=2*r


What is the approximate area of a circle with a diameter of 14 inches?

About 153.86 square in. To find out the area of a circle do: r^2*pi.


When radius is unknown then how to find area of a circle?

By dividing its diameter by 2 is equal to the radius of a circle and its area is pi*radius2