2/09-th-rightangle |

The Right-Angle Theorem |

We find in Ms. Gal. 72 a proposition that is related to 2/06-th-06 and can be perceived of as a restricted version of 2/09-th-09. The proposition can be stated as follows:If from the same point there descend a vertical and an inclined plane, the points reached by falling bodies in the same time along these paths are found as follows: Take any point along the vertical and connect this point with the inclined plane by a line meeting it at a right angle. This crossing point will be the one reached after an equal time of fall along the inclined plane. |

2/09-th-rightangle |