Internally Tangent Circles

Description

Two circles of non-equal radius, both in the same plane, are said to be tangent to each other if they meet at only one point.
Two circles are internally tangent if the distance between their centres is equal to the difference between their radii.

Related formulas

Variables

x1X-coordinate of the center of major circle (dimensionless)
x2X-coordinate of the center of minor circle (dimensionless)
y1Y-coordinate of the center of major circle (dimensionless)
y2Y-coordinate of the center of minor circle (dimensionless)
r1Radius of major circle (dimensionless)
r2Radius of minor circle (dimensionless)