KGB

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• Kirthi P Gumaste Sem II
• Roll no 29.
• Subject Maths
• Class 9th std.

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• Johnny Appleseed

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Introduction

• What is seen in this picture?

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• Johnny Appleseed

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• Congruence
• Two Geometric figures are said to be congruent
  if they have exactly same size and shape.
• Symbol used is ?
• 1. Two angles are congruent if they are
  equal.
• 2.Two circle are congruent if they have
  equal radii.
• 3. Two squares are congruent if the sides
  are equal.
• 4. Two line segments are congruent if
  they have equal length.

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Which pair of triangles is congruent ?
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• Title

• Criteria for Congruence of Triangles.

• Draw two triangles with one side 3cm.
• Are these triangles congruent ?
• Now, draw two triangles with one side 4cm and one
  angle 50 degree.
• Are they congruent?

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• Now, what would happen if the other pair of arms
  of the equal triangles are also equal ?
• Ex For triangle ABC, AB 2cm, BC 4cm ,
  Angle B 50 degree.
• In triangle PQR, PQ 2cm, QR4cm,
  Angle Q 50 degree

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• SAS Congruence Rule
• Two triangles are congruent if two sides and the
  included angle of one triangle are equal to the
  two sides and the included angle of the other
  triangle.

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Home Assignment



Check the
congruence of triangles KLM and HIJ.
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