1a. the set of points in a plane that are equidistant from a given point is called a a. square b. sphere c. segment d. circle 1b. the given point is called the a. vertex b. center c. axis d. radius 2. the equation x^2+y^2-4x+2y=b describes a circle. part a. determine the y-coordinate of the center of the circle. part b. the radius of the circle is 7 units. what is the value of b in the equation? 3. point q lies on st, where point s is located at (-2, -6) and point t is located at (5, 8). if sq: qt = 5: 2, where is point q on st? give the coordinates for q. (use image #1) 4. the circle with center f is divided into sectors. in circle f, eb is a diameter. the radius of circle f is 3 units. match each arc length to its subtended central angle. (use image #2 & #3)