Question
In two triangles ABC and ADC, if AB = AD and BC = CD. Are they congruent?

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| Expenditure (in ₹): | 100-150 | 150-200 | 200-250 | 250-300 | 300-350 | 350-400 | 400-450 | 450-500 |
| No. of manual workers: | 25 | 40 | 33 | 28 | 30 | 22 | 16 | 8 |