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Basic Geometry

Basic Geometry

Similar figures have the same shape, but might not be the same size

  • When two shapes are similar, their corresponding sides are proportional (see ratios and proportions) and their corresponding angles are congruent.
  • An older sister and a younger sister might be considered similar

Congruent figures have the same shape and size.

  • When two shapes are congruent, their corresponding sides and angles are congruent.
  • Identical twins might be considered congruent

Here are two symbols that you need to know:

~ means similar
≅ means congruent

Look Out: be careful when reading which sides correspond to each other; the shapes may be rotated.

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