**TI83F* AppVariable file 04/07/08, 21:014 # MC304# ! nav 69531532B81338D7E4584D0DF165AB24MC304.\$MC3041   congruent#congruent:ÖHaving the same measure. constant rate of changeFconstant rate of change:ÖThe rate of change in a linear relationship.  constant of proportionalityMconstant of proportionality:ÖA constant ratio or unit rate in a proportion.  corresponding partsFcorresponding parts:ÖParts of congruent or similar figures that match. cross products¦cross products:ÖThe product of the terms on the diagonals when two ratios are compared.ÖExample:ÖIn the proportionÖ2/3 = 8/12 the cross products are 2 12 andÖ3 8. dilationWdilation:ÖA transformation that results from the reduction or enlargement of an image.  centerPcenter:ÖThe given point from which all points on a circle are the same distance.  enlargement =enlargement:ÖA dilation with a scale factor greater than 1.   equivalent ratiosLequivalent ratios:ÖTwo ratios that have the same value.ÖExample: 5:4 = 10:8Ö  indirect measurementLindirect measurement:ÖA technique using proportions to find a measurement.   linear relationshipElinear relationship:ÖA relationship that has a straight-line graph.   nonproportionalWnonproportional:ÖA relationship in which two quantities do not have a constant ratio.   polygonQpolygon:ÖA simple closed figure in a plane formed by three or more line segments.  proportionVproportion:ÖAn equation of the form Öa/b = c/d stating that two ratios are equivalent.  proportionalVproportional:ÖTwo quantities are proportional if they have a constant ratio or rate.  ratebrate:ÖThe ratio of two measurements having different units of measure.ÖExample: Ö60 miles per hour rate of change3rate of change:ÖThe change in a quantity over time. ratio/ratio:ÖA comparison of two numbers by division.  reduction<reduction:ÖA dilation with a scale factor between 0 and 1.  scaleVscale:ÖA ratio or rate between the actual size of an object and the size of its model.  scale drawing`scale drawing:ÖA drawing that is similar to an actual object, but is either enlarged or reduced.  scale factor:scale factor:ÖA scale written as a ratio in simplest form.  scale modelgscale model:ÖA replica of an original object that is too large or too small to be built at actual size. similar figuresTsimilar figures:ÖFigures that have the same shape but not necessarily the same size.  unit rate*unit rate:ÖA rate with a denominator of 1.En