Divide the length of a side of one triangle by the length of the corresponding side of the other triangle.
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The answer depends on what ratio of the triangle you are interested in.
The ratio of the length of the side in the big triangle to the length of the corresponding side in the little triangle is the scale factor.
Any triangle whose sides are in the same ratio with the corresponding sides of ABC.
Sine ratio = opposite/hypotenuse
Two triangles are said to be similar if the ratio of the sides of one triangle to the corresponding sides of the other triangle remains the same. One consequence is that all corresponding angles are the same.