4.2-Congruence

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4.2-Congruence Triangles
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Congruent figures

• Have the same size
• And shape.

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Non Congruent figures

• Have different shape
• And size

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Corresponding parts of congruent triangles are
congruent.
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The corresponding sides are also congruent.
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Theorem 4.3-Third Angle Theorem

• If two angles of one triangle are congruent to
  two angles of another triangle,
• Then the third angles are also congruent.

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Are these two triangles congruent?
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Theorem 4.4 Properties of Triangle congruence

• Triangle congruence is
• Reflexive
• Symmetric
• Transitive

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Review Problem

• What is the distance between the points C(3,-8)
  and D(-13,7)?
• What is the coordinate of the midpoint of segment
  CD?

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Assignment 4.2