Say you want to enlarge a triangle 3x its original size. You would take all of the sides and multiply the original lengths by 3. If it is a triangular prism, don't forget to multiply the third dimension by 3 as well.
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Scale Model
When you enlarge or reduce a figure, the angles between the lines in the figure will remain the same. The ratio of the lengths of corresponding sides will also remain the same. Additionally, the shape of the figure will generally stay the same, although its size will change.
I want to enlarge this photograph.
You divide the first something by the second something. You can, if you like, simplify the resulting fraction.