koller6gossty6

Objectives:** Construct a dilation of a segment and a point by using a scale factor. Construct a dilation of a closed plane figure.
 * 8.1 Dilations and Scale Factors

Dilation: an example of transformation that is not rigid. Center of Dilation: the point where the straight line and its image pass through. Contraction: The size of a figure is reduced by a dilation Expansion: The size of a figure is enlarged by a dilation

Objectives:** Define "similar polygons" use properties of proportions and scale factors to solve problems involving similar polygons
 * 8.2 Similar Polygons

Similar Figures: two figures are similar if and onl if one is congruent to the image of the other by dilation.

Polygon similarity postulate: Two polygons ar similar if and only if there is a way of setting up a correspondence between their sides and angles such that the following conditions are met: Each pair of corre