$\"\"$

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The given measures of one triangle is $\"\"$ .

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Sum of the angle measures is $\"\"$ .

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$\"\"$

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

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$\"\"$ (Subtract: $\"\"$ ) $\"\"$

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$\"\"$ , $\"\"$ and $\"\"$ have same measure.

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Let $\"\"$ = the measure of $\"\"$ and $\"\"$ .

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$\"\"$ (Sum of the angle measures is $\"\"$ )

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$\"\"$ (Subtract 42 from each side)

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ ) $\"\"$

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$\"\"$ (Add: $\"\"$

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$\"\"$ (Subtract: $\"\"$

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$\"\"$ (Divide each side by 2

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$\"\"$ (Cancel common term)

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$\"\"$ (Divide: $\"\"$ )

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The angles $\"\"$ and $\"\"$ . $\"\"$

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The given angle measures are not equal.