Graph Figures from Equations Student Handout #2 Note If you need help graphing equations, graphing on a new set of axes, or animating the parameters on a graph, read the document How to Graph an Equation in Microsoft Math. Activity 2: Graph more circles and write their equations 1. What is the radius of the circle with equation (x+1) 2 + y2=100? Where is the center? Graph to verify. 2. Graph a circle that has a radius of 5 with a center of (-2, 2). What is its equation? Activity 3: Work with irrational numbers 1. What is the radius of the circle with equation (x+2) 2 + y2=40? What is the center of the circle? 2. Graph a circle that has a radius of Graph to verify. 5 with a center of (-2, 2). What is its equation? Activity 4: Write the formula or equation for a circle (x-h) 2 + (y-k) 2 =r2 is the equation of a circle where (h,k) is the center of the circle and r is the radius. 1. In the equation x2 + y2=1, what is h, k, and r? 2. In the equation (x-2) 2 + (y+1) 2 = 9, what is h, k, and r? 3. Write the equation of a circle with a center at (-3, 1) and a radius of 5.