Problem 55 of 7
Use the isosceles base angles theorem for AB=AC and angle B=48 degrees.
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infer congruent angles from congruent sides.
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Given equal sides must identify an isosceles triangle.
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Solution
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1. Identify the congruent sides.
2. Locate the opposite base angles.
3. Set those base angles equal and use angle sum if needed.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Making the vertex angle congruent to a base angle without evidence.