| A | B |
|---|
| How do you identify similar figures? | compare parts of figures |
| How do you describe relationships among the side lengths of similar figures? | use scale factor and ratios |
| How do you find a scale factor? | divide 2 corresponding sides from 2 figures |
| How do you know if the scale factor is stretching? | if the scale factor is larger than 1 |
| How do you know if the figure is shrinking? | if the scale factor is smaller than 1 |
| 2 sides of a figure that touch to form a vertex | adjacent |
| sides or angles that have the same position in different similar figures | corresponding sides/angles |
| (x, y) | is always the original figure |
| (2x, y) | makes the figure twice the width |
| (x, 2y) | makes the figure twice the height |
| (x+5, y) | moves the figure 5 spaces right |
| (x, y+5) | moves the figure 5 spaces up |
| (0.25x +4, 3y-9) | makes the figure .25 times the width, moves 4 spaces to the right, 3 times the height, and 9 spaces down |
| perimeter of a new figure | multipy by the scale factor |
| area of a new figure | multiply by the scale factor (squared) |
| 2 shapes are similar | measure of corresponding angles are =, lengths of corresponding sides increase or decrease by same scale factor, and the figures have the exact same shape |
