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Similarity and Congruence

Source: Blue Argyle - phochi/iStock/Getty Images

Making Use of Similarity and Congruence

A scale model of an airplane.

Sources: Model Airplane - kevinjeon00/iStock/Getty Images;

Aircraft - FrankvandenBergh/E+/Getty Images

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Lesson Goals

  • Define congruence and similarity.
  • Calculate the scale factor relating two similar polygons.
  • Determine the perimeter and area of a polygon using similarity.

Try This

A miniature model of a city has \(3\) square metres of green space. If a length of \(1\) metre on the model corresponds to a length of \(1000\) metres in the real world, then how much green space does the city have?

Miniature town made out of blocks.

Source: Miniature City - scanrail/iStock/Getty Image