Circles Features

How many chords?

A ​ (a)   is the set of all points (x,y) in a plan that are equidistant from a fixed point (h,k). The fixed point (h,k) is called the ​ (b)   of the circle. The distance r between the center and any point (x,y) on the circle is the ​ (c)   .​

(x-1)^2+(y+13)^2=16

A set of all points in a plane that are a fixed distance from a fixed point is called a

(a)  

The definition of a circle is

Point B is 17 cm from the center of the circle. AB is tangent to the circle at A. Given that AB = 15 cm, find the radius of the circle.

How long is the radius of this circle?

Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?

Does this picture show the diameter or radius of a circle?

What is line PQ?