### Home > PC3 > Chapter 12 > Lesson 12.1.4 > Problem 12-60

12-60.

Write the equation of each conic described below.

A circle centered at

with a circumference of . If the circumference of a circle is

, what is the radius of this circle? An ellipse that has foci at

and and a major axis of length . The center of the ellipse lies at the midpoint of the two foci.