Circles |

Similar
Congruent means exactly the same in shape and size. With similar figures, corresponding sides are proportional, and, because proportionality is studies from a very early grade, many may find the lengths of unknown sides mentally. If one can not mentally find the misssing value, it may be found by cross multipling. |

www.mathnstuff.com/math/spoken/here/2class/250/c25pg00.htm |