Respuesta :

Answer:

d

Step-by-step explanation:

In order for the two triangles to be similar the ratio of each side has to be the same. in answer do the ratios would be 21 to 17.5 and 18 to 15 and both ratios equal 1.2 which means they are similar triangles.
In my opinion I think it’s b bc on the right of b it shows 9 which is half of 18

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