A circle has a center at #(7 ,9 )# and passes through #(1 ,1 )#. What is the length of an arc covering #(3pi ) /4 # radians on the circle?
First thing to do is to find the length of the radius. The line segment joining the center of the circle to <b>any</b> point on the circle constitutes a radius.
Therefore, the line segment joining
Next, you should know that an arc subtending an angle of