3 Equal Lines and Angles in Triangle
May 30, 2024 2025-05-30 0:313 Equal Lines and Angles in Triangle

3 Equal Lines and Angles in Triangle
Table of Contents
Toggle📐 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

🧪 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 \( \angle C \)?

🔽 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 \( \angle C = 2x = 64^\circ \)

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