Click and drag around the points below to explore and discover the rule for parallel lines cut by a transversal on your own. You can click and drag points A, B, and C.

You can create a customized shareable link (at bottom) that will remember the exact state of the app--which angles are selected and where the points are, so that you can share your it with others.

∠A | 90 | ∠W | 90 |
---|---|---|---|

∠B | 90 | ∠X | 90 |

∠C | 90 | ∠Y | 90 |

∠D | 90 | ∠Z | 90 |

Drag Points Of The Lines To Start Demonstration