given in Examine equations of standard form or general form. Identify the Write the Determine if a given lles on and radius of a circle. of a circle. a circle. Words to Know Write the letter of the definition next to the matching word as you work through the lesson. You may use the glossary to help you. center circle hypotenuse radius A. the set of all points in a plane that are a given distance away from a given point called the center B. a segment that extends from the center of a circle to any point on the circle C. the fixed point that is equidistant from all points on a circle D. the side of a right triangle that is opposite the right angle and is always the longest side of the triangle