Proving Triangles Similar

1
Proving Triangles Similar

• Chapter 7 Section 3

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Objective

• Students will use AA Postulate and the SAS and
  SSS Theorems
• Students will use similarity to find indirect
  measurements.

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Angle-Angle Similarity (AA )Postulate 7-1

• If two angles of one triangle are congruent to
  two angles of another triangle, then the
  triangles are similar.

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Turn to Page 451

• Look at Problem 1
• Try the Got It problem for that section.

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Side-Angle-Side Similarity(SAS)Theorem 7-1

• If an angle of one triangle is congruent to an
  angle of a second triangle, and the sides that
  include the two angles are proportional, then the
  triangles are similar.

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Side-Side-Side Similarity(SSS)Theorem 7-2

• If the corresponding sides of two triangles are
  proportional, then the triangles are similar.

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Turn to Page 452

• Look at Problem 2 and Problem 3
• Try the Got It problems for each of these
  examples.

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Indirect Measurement

• Finding the lengths of a similar figure to find
  the lengths of an immeasurable figure using
  proportional reasoning.

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Page 454

• Look at Problem 4
• Try the Got It problem for that example.

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On page 455

• Try problems 1-6 on your own

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Beginning on Page 455

• Work problems 7-28

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Exit Slip/Reflection

1. Page 458 41 through 52.