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Perpendicular Pairs
For each slope, name its negative reciprocal
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| A | B |
|---|
| 1 | -1 |
| 1 / 2 | -2 |
| -2 / 3 | 3 / 2 or 1.5 |
| 1 / 4 | -4 |
| -3 / 4 | 4 / 3 or 1.333 |
| -1 / 5 | 5 |
| 4 / 5 | -5 / 4 or -1.25 |
| -3 / 8 | 8 / 3 or 2.667 |
| 2 / 9 | -9 / 2 or -4.5 |
| -2 | 1 / 2 or 0.5 |
| -0.5 | 2 |
| 0.333 | -3 |
| 0.4 or 2 / 5 | -5 / 2 or -2.5 |
| 0.111 or 1 / 9 | -9 |
| 0 | undefined |
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