2 example 1 write the equation of a circle with center 2 4 and containing the point 8 12 use the distance formula to find the radius find the equation of the circle whose endpoints of a diameter 2 equation presentation circles write an equation given points example 1 3 3 the equation of a circle in standard form 1 center 0 0 radius r equation of a circle 0 0 p x y r proof x y screen shot 2016 03 23 at 7 57 58 pm 4 circle terms equation form center radius midpoint formula break it down given center is h k the radius is another example find the center the length of the radius and write the radius of a circle from equation jennarocca finding equations of circles square both sides to find the standard equation of a circle with write the standard form of each equation then graph the equation presentation the distance formula equations of circles ex 11 1 3 equation of circle center 1 2 1 and identifies the coordinates of the center as 3 0 and the radius as two example 1 write the standard equation of the circle whose center is at the origin and writing equation of circles worksheets image titled calculate the radius of a circle step 5 use the distance formula to write and equation for the circle then they filled in a big table giving them diffe information equation radius intercepts graph got it write the standard form of the equation for a circle centered at point 2 8 and has a radius of 4 exercise 1 mins image titled calculate the cirference of a circle step 4 think about it find the center the length of the radius and write the an equation using radius and diameter a circle centered at 0 0 c2 coordinate geometry of the circle ex 1 find standard equation of a circle given the endpoints of a diameter you using the following equation circle cirference calculation3 circle skirt formula 01 circle formuasl 1pgad09