Coordinate Geometry .6

Question 1

Don’t intersect (not one circle within the other)

Answer 1

d>r1+r2

Question 2

Don’t intersect one another (concentric circles)

Answer 2

d=0
and r1 does not = r2

Question 3

Don’t intersect (one circle within the other but not concentric circles)

Answer 3

r1 + d < r2

Question 4

Tangent to one another (not one circle inside the other)

Answer 4

d=r1+r2

Question 5

Tangent to one another (one circle within the other)

Answer 5

d=r2-r1

Question 6

Intersect at two distinct points

Answer 6

d<r1+r2

Question 7

Finding the distance between two points

Answer 7

Square root of (x2-x1)^2+(y2-y1)^2

Question 8

Finding the midpoint of the line connecting two points

Answer 8

(x1+x2/2 , y1+y2/2)