A circle is a shape consisting of all points in a plane that are a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant.The distance between any point of the circle and the centre is called the radius.This article is about circles in Euclidean geometry, and, in particular, … See A. wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. The radius is the distance from the center of the circle to its edge. Circumference = π * Diameter Diameter of a Circle The diameter of a circle is the distance from one … Finally, you can find the diameter - it is simply double the radius: D = 2 * R = 2 * 14 = 28 cm. Because finding the exact center may prove difficult, it's best to take several measurements to ensure accuracy. Learn more about diameter, circle 2.1. Since the radius is half the diameter, to get the diameter, you'd multiply the 6 cm by 2. If the radius of a circl… Points A, B, M, N, P, Q, X, Y lie on the circle. How to find the circle's diameter depends on the information available. How can I find the coordinates of a diameter? Enter any single value and the other three will be calculated. If you know the radius of the circle, double it to get the diameter. The circumference is the length all the way around the outside of the circle. The Diameter of a Circle. ExampleIf the circumference of the circle is 10 cm, then the diameter is 10 cm/π, or 3.18 cm. Drag the orange dot at the end of the radius line. The center of a circle is the midpoint of its diameter. If the diameter (d) is equal to 10, you write this value as d = 10. Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm. circles. How do I trace a circle with a diameter of 4 cm? Similarly, if you enter the area, the radius needed to get that area will be calculated, along with the diameter and circumference. The formula for calculating the diameter of the circle of the radius: D=2R Where D - diameter of the circle, S - area of a circle, P - the length of the circle, R - radius, π - … Both definitions are also valid for the diameter of a sphere. If you know the radius of the circle, multiply it by 2 to find the diameter. Remember that the diameter is double the length of the radius. To get the area, square the radius, and then multiply by pi. You're likely to find that questions of geometry will seem less challenging with a little experience. The circumference is the distance around the edge of the circle. Use a drawing program and set the circle properties so that it has a diameter of 4 cm. Reset Calculate. AB is a diameter of the circle APBR as shown in the figure. Find the radius, circumference, and area of a circle if its diameter is equal to 10 feet in length. The diameter of a circle is the length of a straight line drawn between two points on a circle where the line also passes through the centre of a circle, or any two points on the circle, as long as they are exactly 180 degrees apart. You can find the circumference by using the formula. You can also use it to find the area of a circle: A = π * R² = π * 14² = 615.752 cm². APQ and RBQ are straight lines. Formula for finding diameter using circumference: D … We use cookies to make wikiHow great. To find the circumference of a circle, multiply the diameter with pi. This multiplication of course can be done the other way around as well: C = π ∙ d. EXAMPLE: Find the circumference of a hole with a diameter of 4.00 inches. Need help with the radius of a circle and the diameter of a circle? We can see this on the graphic below: You can also work out the circumference of a circle if you know its radius. Read the article to learn how to calculate the diameter of a circle using a ruler! The radius is half the diameter. If the circle is drawn to scale or if it's an actual circle, you can calculate the diameter by measuring from one side of the circle to another, making sure the ruler passes through the circle's center. 1. The area, radius and circumference will be calculated. If you don't have the radius, divide the circumference of the circle by π to get the diameter. Find something that is 4 cm in diameter (or slightly smaller) and draw around it. Use the calculator above to calculate the properties of a circle. The diameter is the length of a straight line drawn through the center of a circle from one side to the other. Calculating a circle's diameter is easy if you know any of the other dimensions of the circle: the radius, the circumference, or the area. 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