Assuming you are already sure that the two objects are, indeed, similar: You measure corresponding lengths of the two objects, and divide.
You measure the lengths of a pair of corresponding sides. The scale factor is the ratio of the two measures.
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The linear scale factor is proportional to the cube root of the volumes.
well.... first off you have to find the scale factor...
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.
The ratio of the volumes of similar solids is (the ratio of their linear dimensions)3 .
The linear scale factor is 100.