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An asymmetric enlargement. A convolution, Fourier transformation, for example.
With trigonometry by using the cosine rule
The study is called trigonometry.
Yes normally, a scalene triangle is an example.
no: if you have two triangles with the same angle measurements, but one has side lengths of 3in, 4in, and 5in and the other has side lengths of 6in, 8in, and 10in, then they are similar. Congruent triangles have the same angle measures AND side lengths.