Question
Plot the point $A (2,-3), B (-1,2)$ and $C (0,-2)$ on the graph paper. Draw the triangle formed by reflecting these points in the $x$-axis. Are the two triangles congruent?
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| Class interval | $20 - 30$ | $30 - 40$ | $40 - 50$ | $50 - 60$ | $60 - 70$ | $70 - 80$ |
| Frequency | $10$ | $6$ | $8$ | $12$ | $5$ | $9$ |
| $C.I$ | $50-55$ | $55-60 $ | $60-65$ | $65-70$ | $70-75$ | $75-80$ | $80-85$ | $85-90$ |
| Frequency | $5$ | $20$ | $10$ | $10$ | $9$ | $6$ | $12$ | $8$ |