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/_\ABC is an isosceles triangle. 6 .
Given: 
/_5~=/_6
Prove: 
/_\ABC is an isosceles triangle.
Proof:
335

66. ABC \triangle \mathrm{ABC} is an isosceles triangle. 66 .\newline1414. Given: 56 \angle 5 \cong \angle 6 \newlineProve: ABC \triangle A B C is an isosceles triangle.\newlineProof:\newline335335

Full solution

Q. 66. ABC \triangle \mathrm{ABC} is an isosceles triangle. 66 .\newline1414. Given: 56 \angle 5 \cong \angle 6 \newlineProve: ABC \triangle A B C is an isosceles triangle.\newlineProof:\newline335335
  1. Identify Given & Prove: Identify the given information and what needs to be proven.\newlineGiven: \angle 5 \(\newlineot\approx \angle 6\), we need to prove that ABC\triangle ABC is an isosceles triangle.
  2. Recall Isosceles Triangle: Recall the definition of an isosceles triangle. An isosceles triangle has at least two sides that are equal in length, which also means at least two angles are equal.
  3. Use Given Information: Use the given information to relate it to the definition of an isosceles triangle.\newlineSince 56\angle 5 \neq \angle 6, it means two angles in the triangle are congruent.
  4. Determine Opposite Sides: Determine which sides are opposite to the congruent angles.\newlineThe sides opposite to 5\angle 5 and 6\angle 6 must be equal in length because angles opposite to equal sides in a triangle are equal.
  5. State Conclusion: State the conclusion based on the previous steps.\newlineSince the sides opposite to 5\angle 5 and 6\angle 6 are equal, triangle ABCABC is an isosceles triangle.

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