### Home > INT2 > Chapter 10 > Lesson 10.2.1 > Problem10-54

10-54.

On graph paper, graph the circles given by the equations below. For each one, state the center and radius.

Refer to the Math Notes box from Lesson 10.1.2 for help with the equation of a circle.

1. $x^2 + y^2 = 4.5^2$

C: $(0, 0)$;  $r = 4.5$

1. $x^2 + y^2 = 75$

Notice the difference between part (b) and part (a).

1. $(x - 3)^2 + y^2 = 1$

$(3, 0); r = 1$

1. $x^2 - 4x + y^2 - 2y = 14$

Complete the square to solve for the center.