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proportions are equal things like say 10 hot dogs = 10 hamburgers. same for simalar figures except with shapes or figures.
proportions are used in scale factors; scale factors ARE proportions
All congruent figures are similar figures, and have identical sizes.
Any two corresponding sides in two similar figures have a common ratio called the scale factor. Since the figures are similar, the ratios of the lengths of corresponding sides of the figures are equal. 1. Match a side of both figures, 2. write the proportions 3. substitute the values 4. Write the cross product 5. Divide both sides by a common factor 6. simplify 7. Convert improper fraction into mixed number
Are congruent figures always similar? Yes.