What is similar triangles?

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Solution

Two triangles are similar if and only if corresponding angles have the same measure: this implies they are similar if and only if the length of corresponding sides are proportional.

Note: Triangles are similar if they have the same shape, but not necessarily the same size.

Example of similar triangles : From above, $△ P Q R \sim △ P^{'} Q^{'} R^{'}$

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