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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.
Congruent figures are similar - in sides as well as angles. Corresonding angles of similar figures congruent but their sides are not. The sides are all in some fixed ratio. [If that ratio is 1, the figures are congruent.]
It doesn't reduce.
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