Area of a circle having a circumference of 34 pie

The equation for the circumference of a circle is , where c=circumference and r=radius of the circle. 

Since you know c = 34π, plug that into the equation for the circumference of the circle and solve for r, the radius:
c = 2πr
34π = 2πr
34 = 2r
r = 17

The equation for the area of a circle is , where A=area of the circle and r=radius of the circle. 

Since you know the radius = 17, plug that into the equation for the area of a circle to find the area:


The area of your circle is 289π.

Polar coordinates is 8,9