Circle A has a center at #(2 ,-1 )# and a radius of #2 #. Circle B has a center at #(-3 ,6 )# and a radius of #1 #. Do the circles overlap? If not, what is the smallest distance between them?

1 Answer
Feb 17, 2016

Circles do not overlap and smallest distance between them is #5.6023#

Explanation:

Distance between #(2,-1)# and #(-3,6)# is given by

#sqrt((2-(-3))^2+((-1)-6)^2)# i.e. #sqrt(5^2+7^2)# i.e. #sqrt74=8.6023#

As radius of circle A is #2# and of circle B is #1# and

sum of radii i.e. #3# is less than distance (#8.6023#) between them they do not overlap and smallest distance between them is #8.6023-3=5.6023#

As sum of the radius of the two circles at #8.4495# is more than distance of #6.3246# between them, circles do overlap,