Radius Of A Circle Research Paper
Smiley, Gregory
College Algebra- Math 1111- SO
Finding the center and radius of a circle
So you want to know what is a radius, a radius is a straight line from the center of a cirlce to the circumference of a circle. So if you have more than one it would be referenced as radii also remember that all radii in a cirlce willl always be the same length. The circumference is on the outside of a perimeter of a cirlce. A radius can be a line from any point on the circumferecne to the center of the cirlce. If you know the diameter of the circle, use the formula of radius = diameter/2. Something about the center of a cirlce and the radius is this. If you swing a rope on a stick if would go around the stick at the same distance. Really what that means is it doesn't matter what side the radius is on its always the same distance on both sides of the cirlce and never negative. So what we will be doing today is putting an equation into standard form which looks like this (x-s)2+(y-t)2 =r2 then putting it back into general form which looks like this x2+y2+ax+by+c=0.
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So now we will be putting this equation into standard form from general form. So the first step of this would be to move the 22 without a variable onto the other side of the equation to put the variables on one side and real numbers on one side. So now your equation should turn out like this x2+18x+y2+6y=-22. Next you would want to complete the square with variables 18x and 6y, in order to complete this is cutting 18 in half then multiplying it by itself which would come out to be 18-9=9 then 9x9=81 and then do the same for 6y which is 6-3=3 then
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