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If two figures have the same shape & size,
they are congruent
For example
Here,
AB & PQ have
- Same shape - both are lines
- Same size – both are 5 cm
So, they are congruent.
How to check if they are congruent?
We rotate PQ
& superimpose it an AB
Since, PQ comes AB exactly…
They are congruent
Some common shapes that are congruent are
Congruency Symbol
If two figures are congruent
We write
AB ≅ PQ
If two figures are not congruent like
We write,
XY ≇ CD
