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| Introduction |
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| Look at the pairs of figures in (A), (B), (C). They look alike. They have the same shape, though they do not have the same size. We say that they look alike or they are similar. The photograph of a person looks exactly like the person, though it is not of the same size. They are similar to each other. Triangles are similar if they are equiangular and their corresponding sides are proportional. |
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