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3 Equal Lines and Angles in Triangle

Geometry-Mensuration
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3 Equal Lines and Angles in Triangle

CAT Geometry Concept – Triangle Medians & Angle

📐 Concept: 3 Equal Lines and Angles in Triangle

Let triangle \( \triangle ABC \) have point \( D \) as a point on \( BC \).

Now, if \( BD = AD = AC \), then triangle has special symmetry.

From the triangle:

  • \( AD = BD = DC \) implies triangle is divided into isosceles components
  • Use of angle algebra can help break this down
Triangle Median Angle Breakdown

🧪 CAT 2006 Question on Geometry

Q. In triangle \( \triangle ABC \), point \( D \) is a point on \( BC \). If \( BD=AD = AC \) and \( \angle DAC = 96^\circ \), then what is \( \angle C \)?

CAT 2006 Geometry Question Diagram
🔽 Show Answer & Step-by-Step Solution

Given:

  • \( AD = AC \)
  • \( D \) is midpoint of \( BC \)
  • \( \angle DAC = 96^\circ \)

Since \( AD = AC \), triangle \( \triangle ADC \) is isosceles.

Let \( \angle DBC = \angle x \), then \( \angle DAC = x \) and the external angle becomes:

\[ \angle DAC + \angle CAB = 96^\circ \Rightarrow 2x = 96^\circ \Rightarrow x = 32^\circ \]

Now, use this to find angle \( \angle C = 2x = 64^\circ \)

CAT 2006 Solution Diagram

✅ Final Answer: \( \boxed{64^\circ} \)

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