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Triangle RST has angles measuring 38° and 75°. Triangle R′S′T′ has angles measuring 67° and 38°. The sides are proportional.. Is it dilation? If not what is it??

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The third angle of triangle RST is 180-38-75 = 67
which is one of the given angle of the second triangle.
So both triangles have the same angles and the sides are proportional.
The two triangles are similar, therefore one is a dilation of the other.
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