FIND CENTER AND RADIUS OF A CIRCLE FROM AN EQUATION WORKSHEET

Write down the center and radius of each circle below

Problem 1 :

x² + y² = 25

Solution

Problem 2 :

x² + y² = 12

Solution

Problem 3 :

(x – 3)² + (y – 2)² = 36

Solution

Problem 4 :

(x + 1)² + (y – 4)² = 10

Solution

Problem 5 :

x² + y² – 10x – 6y - 2 = 0

Solution

Problem 6 :

x² + y² + 6x + 4y + 4 = 0

Solution

Problem 7 :

The point (a, 5) lies on the circle with equation x² + y² = 74. Find two values for a.          Solution

Problem 8 :

The point (3, c) lies on the circle x² + y² – 4x + 6y + 12 = 0. Find c.

Solution