The answer will depend on how the triangle is situated within the rectangle (how many of the triangle's vertices coincide with those of the rectangle), and what other information you have.
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You cannot.
use the inverse sine or cosine or tangent
The 3 interior angles of any triangle add up to 180 degrees
no because the algorithum states it mst be a triangle for the algorithem to work
When each of the 3 interior angles measure less than 90 degrees and the 3 sides are of different lengths