Equations of circles Use the results of Exercise to describe and graph the following circles.r2 ? 8r cos (? ? ?/2) = 9

Solution 70EStep 1:We have shown that the polar equation represents a circle of radius R centered at and We compare the given equation with the equation to find and R.Comparing, we getWe know that the equation can be written as.Using the values of in the above equation, we get describes a circle of radius centered at ()Graph of the circle of radius 5 centered at (0,4) is: