Originally Posted by

**DocBane** Hello, this is probably an easy thing for most of you but I just can't find the jist of this problem.

There's two circles perpendicular intersecting each other, C1 and C2. C1 intersects the connecting line between the centre points of C1 and C2 at the midpoint of the radius of C2. I am to define the relationship of the radii when r2 : r1 = 4 : ?

I'm just not sure how I am supposed to define it. I'm guessing I should use a right-angled triangle to determine the unknown.