Yes, our tool is that awesome. Circle Calculator. The formula for calculating the area of a circle is: π r 2 (with r being the radius of the circle, which is half the diameter). 5 Answers. How to Calculate Diameter to Square Feet ... Divide the diameter, measured in feet, by two to find the radius of the circle. You can calculate the area of the circle border in square feet, in square inches, square yards, square centimetres, square millimetres and square meters. The Square Footage Calculator estimates the square footage of a lot, house, or other surfaces in several common shapes. Area = π * Radius 2. Circle calculator, formula, work with steps, step by step calculation, real world and practice problems to learn how to find the area, circumference & diameter of a circle in inches, feet… If the radius of the circle was measured in inches, multiply the number by 0.0833333 using the calculator. Measure the radius of the circle, in feet. This is the length of the line from the middle of the circle to any point on its edge. Convert the radius to feet. The formula for calculating the area of a circle is pi times radius squared. radius = 8 feet. As a circle it would have a radius equal to the square root of 5 divided by PI. The area A of a circle of radius r is given by [math]A=\pi r^2[/math]. Then click Calculate. Our calculator gives you the option of calculating the exact cost of materials. The radius of a one foot diameter circle it 1/2 or .5 feet. For example, if the circle's diameter equals 4.5 feet, divide 4.5 by 2 to get 2.25 feet for the radius. For instance if your radius measures 9 inches, you convert from inches to feet by dividing the radius by 12 because there are 12 inches in a foot. Enter one value and choose the number of decimal places. If however the circle is 6 feet circumference you need to find the diameter first. Determine the radius of the circle. The square foot calculator determines the square footage for rectangle, triangle, trapezoid, circle, rhombus and square. Our calculator gives you the option of calculating the exact cost of materials. Square the Radius; Multiply the radius by the radius. where the circumference is equal to 2 times pi times the radius If the diameter is 5ft then the radius is 2.5 ft (r=d/2) r=2.5 ft π≈3.1415926535898- c=2πr c=2π(2.5) c=5π c≈15.708 ft. A circle has many different radii and many different diameters, and each one passes through the center. You can calculate the area in square feet, in square inches, square yards, square centimetres, square millimetres and square meters. Relevance. .5 squared is .25 PI is 3.1416 3.1416 times .25 = .79 square feet So, there are about .8 square feet in a 1 foot diameter circle. The area of a circle is pi times the square of its radius. How to calculate square footage for rectangular, round and bordered areas. The radius is half the diameter, so the radius is 5 feet, or r = 5 . Its mathematically accurate and useful for Construction projects, wood workers, home owners, students, and real estate. To calculate circumference from a circle's radius, multiply the radius by 2, and then multiply the result by π, or C = 2rπ. Square Footage Calculator. Radius of a Circle. If the diameter ( d ) is equal to 10, you write this value as d = 10 . This is a useful home tool that you can use whenever you need to compute an area, from when you are about to tile a floor, seed a lawn or to estimate wallpaper amount and started wondering how to calculate square footage. So your radius measurement of 9 inches equals .75 feet. 9 years ago. Circle Calculator. If you need to convert into feet from another unit of measure, you can do it before or after performing this calculation; just make sure you always label your calculations with … Learning how to calculate square footage is easy. A circle is the set of all points on a plane with the same distance (the radius) to a certain point, which is called center. Answer Save. π is the symbol for pi (3.14159265). Yes, it is that awesome. Calculations at a circle. Determining the square feet of a circular pool is the same as determining the area of a circle. π is the symbol for pi (3.14159265). So, to find the area of a circle in square feet, follow these steps: 1. The circumference is defined to be c=2πr. Calculate the area of a pool so you'll know how much land a round pool will take up on your property. The conversion of a given diameter to square feet uses a simple formula for determining the area of a circle. The formula for calculating the area of a circle is: π r 2 (with r being the radius of the circle, which is half the diameter). Circumference, diameter and radii are calculated in linear units, such as inches and centimeters. Find the radius, circumference, and area of a circle if its diameter is equal to 10 feet in length. 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