Circles

Question 1

If x²+y² = r² what is the centre and radius

Answer 1

(0,0) radius = r

Question 2

If (x-h)²+(y-k)² = r² what is the centre and radius

Answer 2

(h,k) radius = r

Question 3

How to get the circle x² + y² +ax +by + c = 0 into different form

Answer 3

complete the square for x and y

Question 4

How to found out the coordinate in which a circle and line intercept

Answer 4

simultaneously solve them