SOLUTION: Two circles have the same centre. The larger circle has a diameter of 3.2cm and the distance between the circles is 0.9cm. What is the diameter of the smaller circle? Thank you

Algebra ->  Circles -> SOLUTION: Two circles have the same centre. The larger circle has a diameter of 3.2cm and the distance between the circles is 0.9cm. What is the diameter of the smaller circle? Thank you       Log On


   

Question 971422: Two circles have the same centre. The larger circle has a diameter of 3.2cm and the distance between the circles is 0.9cm. What is the diameter of the smaller circle?
Thank you so much!
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
RADIUS of the larger circle is 1.6 cm. The distance from smaller circle to larger circle is 1.6-r=0.9, using r as the radius of the smaller circle.
r=1.6-0.9
r=0.7
the diameter is then 2%280.7%29=highlight%281.4%29 for the smaller circle.