You may be asked to show that two circles are touching, and say whether they're touching internally or externally. To do this, you need to work out the radius and the centre of each circle.

The Arapahoe County Sheriff’s Office is filing obstruction charges on two suspects after about 100 dirt bikes and motorcycles ...

If their circles are nested or nearly overlap so that the external angle of intersection is greater than 90 degrees, then you cannot claim that the means of the two groups are different. If, however, ...

Three people were seriously injured late Friday night in the collision of two off-road motorcycles at a southeast Prineville ...