\"\"

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The lengths of the three sides of a triangle is 10,14 and 18 inches.

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Let \"\", \"\" and \"\"

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In a right angle triangle \"\"

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Substitute the values in above equation

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\"\"

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\"\"            (Evaluate powers: \"\")

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\"\"               (Evaluate power:  \"\")

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\"\"                          (Add: \"\")

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\"\"                          (Equation is not true) \ \ \"\"

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The triangle is not a right triangle.