Given:
The objective is to find whether the two triangles are similar or not with explanation.
The given triangles can be represented as,
From the given figure, the sides AB = AC = 13.5 and the sides DE = DF = 7.5.
For two triangles to be similar, the ratio of their adjacent sides should be equal.
The ratios are,

Now, apply the given values in the above ratio.

Thus, the ratios of sides of the two triangles are similar.
Hence, the two triangles are similar triangles.