Question
State the locus of a point moving so that its perpendicular distances from two given lines is always equal.

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| Class Interval | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 |
| Frequancy | 12 | 20 | 26 | 18 | 10 | 6 |
