# 1/r=1/r1+1/r2

Input |
---|

1/r = 1/r1 + 1/r2 |

Geometric figure |

infinite elliptic cone |

Alternate form assuming r, r1, and r2 are positive |

r1 r2 = r (r1 + r2) |

Solution |

r – r1!=0, r2 = -(r r1)/(r – r1), r r1!=0 |

Input |
---|

1/r = 1/r1 + 1/r2 |

Geometric figure |

infinite elliptic cone |

Alternate form assuming r, r1, and r2 are positive |

r1 r2 = r (r1 + r2) |

Solution |

r – r1!=0, r2 = -(r r1)/(r – r1), r r1!=0 |