A circle with a 23 inch diameter has am area of 415.4756 sq inches (to 4 dp). For example, if a pizza costs $32 and has an area of 314 square inches, you would calculate ÷ =. To run the calculator, hit the 'Calculate Circle Dimensions' button when you have entered the known diameter. Bisect them you get 67.5 degrees for half each interior angle. All of these values are related through the mathematical constant π, or pi, which is the ratio of a circle's circumference to its diameter, and is approximately 3.14159. π is an irrational number meaning that it cannot be expressed exactly as a fraction (though it is often approximated as 22/7) and its decimal representation never ends or has a permanent repeating pattern. Still have questions? Example: You want a finished 12″ diameter base (a 12″ diameter circle) in a duffle bag. Anonymous. Or a rectangular skillet with rounded corners…. Compute the area using these units: square mils, square inches, square feet, square yards, square miles, acres, hectares, square millimeters, square centimeters, square meters, and square kilometers. A circle of radius = 5 or diameter = 10 or circumference = 31.42 inches has an area of: 5.06709 × 10-8 square kilometers (km²); 0.0506709 square meters (m²) 506.709 square centimeters (cm²) Lv 6. Multiply Pi (3.1416) with the square of the radius (r) 2. The diameter of a circle is the circumference multiplied by 0.31831. So, the cost per square inch of pizza is about .10, or 10 cents. You can also convert using our handy cubic inches to … what is the square inches inside a 10 inch circle? How many square inches in a 23 inch diameter circle? Without any adaptions, your 10-inch cake layers will be very thin. A decimal can be used if the measurement is not a whole number. Directions: Use the calculator above to calculate your square inches. I think 120 square inches sounds like so much more than 10 by 12! A circle with a 12 mm radius has a diameter of 24 mm. ft. ... 78.540: square inches: 0.54542: square feet: 0.060602: square yards: 0.050671: square meters: 506.71: square centimeters (results may be rounded) Area of a Circle Formula. Or the circumference? How Do You Convert Diameter to Square Inches? the external angles would be 45, so internal 135. 6 Answers. A 36-inch diameter circle has an area of: 1,017.9 square inches. The area of an 8-inch square is 64 square inches because 8 x 8 = 64; the area of a 9 x 13-inch pan is 117 square inches because 9 x 13 = 117. The distance between any point of a circle and the center of a circle is called its radius, while the diameter of a circle is defined as the largest distance between any two points on a circle. #approxcolor(blue)(79# square inches. Then the side length would be 27/sqrt[2] For the octogon. The area of a circle is the diameter x diameter x 0.7854. It is a set of all points in a plane that are equidistant from a given point, called the center. ", right? Square footage is calculated by multiplying width by length or width by height. If the diameter is seven feet, four inches, enter “7.33”. The area #= pir^2 = 3.14 xx (5)^2# #=3.14 xx (25)# #=78.5# square inches. You can sign in to vote the answer. So angles are 45-67.5-67.5 Each congruent side is half of 27 or 13.5 So by law of sines, 13.5 / Sin[67.5] = s / Sin[45] Then s = 13.5 * sin[45] / Sin[67.5] = 13.5 / (sqrt[2]*sin[67.5]) From here, use the calculator. For a rectangle, simply take the measurements of the long side and the short side of a rectangular one and multiply them, i.e. Calculated out this gives an area of 28.2744 Square Inches. You can calculate the area of the circle border in square feet, in square inches, square yards, square centimetres, square millimetres and square meters. So much more than 10 by 12 approach is to enter the depth is inches! 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