testing a point (circles)

Question 1

(a,b)

Answer 1

centre

Question 2

(p,q)

Answer 2

point

Question 3

(p-a)^2 + (q-b)^2 < r^2

Answer 3

the point lies within a circle

Question 4

(p-a)^2 + (q-b)^2 = r^2

Answer 4

point lies on the circumference

Question 5

(p-a)^2 + (q-b)^2 > r^2

Answer 5

point lies outwith the circle