Problem 80 of 7
Prove the triangle type using coordinates for A(1,1), B(1,5), C(4,1).
Hints
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use side lengths and slopes.
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Proof must use side lengths or slopes to justify triangle type.
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Solution
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1. Compute relevant side lengths and slopes.
2. Compare lengths or check perpendicular slopes.
3. State the triangle type justified by the evidence.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Classification from appearance only.