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# Marcus Math Ch 7

### marcus math vocab

In the proportion a/b=c/d, where b is not equal to 0 and d is not equal to 0, the cross products are ad and bc. The proportion is true if and only if the cross products are equal. cross products
A transformation determined by a center point C and a scale factor k. When k>0, the image P prime of P is the point on ray CP such that CPprime=/k/*CP. When k<0, the image P prime of P is the point on the ray opposite ray CP such that CPprime=k*CP. dilation
An image that is larger then the original figure. enlargement
In a/b=c/d, the numbers a and d extremes
In a/b=c/d, the numbers b and c means
A segment with endpoints that are the midpoints of two sides of a triangle. midsegment of a triangle
An equation of the form a/b=c/d that states that two ratios are equal. proportion
A comparison of two quantities using division. ratio
An image that is smaller than the original figure. reduction
The ratio of a length on the model or drawing to the actual length of the object being modeled or drawn. scale
A drawing with lengths proportional to the object it represents. scale drawing
The ratio of the lengths of two corresponding sides of two similar polygons or two similar solids. scale factor
An object with lengths proportional to the object it represents. scale model
Polygons that have the same shape but not necessarily the same size. similar polygons
When a figure and its transformation image are similar. similarity transformation
Created by: kmmspatriots