| A | B |
|---|
| ratio | comparison of two quantities using division |
| indirect measurement | find something's height using proportions |
| means | numerator of the 1st and denominator of the 2nd ratio |
| extremes | denominator of the 1st and numerator of the 2nd ratio |
| geometric mean | square root of the extremes |
| scale drawing | same shape proportional sized model |
| scale | ratio of dimension in model to actual dimensions |
| similar | congruent angles, proportional sides |
| diltaion | a transformation that proportionally changes the size of the object |
| reduction | dilation with 0< scale factor<1 |
| enlargement | dilation with a scale factor >1 |
| cross products | that which is equal in a proportion |
| root | inverse operation of exponent |
| reciprocal property | if a/b = c/d, then b/a = d/c |
| interchange the means | if a/b = c/d, then a/c = b/d |
| add the denominator | if a/b = c/d, then (a+b)/b = (c+d)/d |
| perimeters | ratio of these is equal to ratio of corresponding sides in similar polygons |
| corresponding sides | these must be proportional in similar polygons |
| altitude | distance from any vertex to the opposite side in a triangle |
| Angle-Angle Similarity Postulate | IF two angles in one triangle = corresp. angles in another, the triangles are similar |
| Side-Side-Side Similarity Theorem | If all corresponding sides between tow triangles are proportionsl, the triangles are similar |
| Side-Angle-Side Similarity Theorem | 1 of the 3 similarity postulates /theorems |
| center of dilation | the necessary fixed point for a reduction or enlargement |
| proportion | equivalent ratios |
