# 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.

## Variables

x_{1} | X-coordinate of the center of major circle (dimensionless) |

x_{2} | X-coordinate of the center of minor circle (dimensionless) |

y_{1} | Y-coordinate of the center of major circle (dimensionless) |

y_{2} | Y-coordinate of the center of minor circle (dimensionless) |

r_{1} | Radius of major circle (dimensionless) |

r_{2} | Radius of minor circle (dimensionless) |