$\"\"$

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The given angles are $\"\"$ .

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Since $\"\"$ .

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Since $\"\"$ .

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So, sum of the measures of the smaller angles is equals the largest angle.

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So, $\"\"$ $\"\"$

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Sum of the measures of the smaller angles is equals the largest angle.

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$\"\"$ \ \

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$\"\"$ (Substitute $\"\"$ )

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

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

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$\"\"$ (Add 14 to each side)

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

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$\"\"$ (Divide each side by 26)

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$\"\"$ (Cancel common terms)

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

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The value of a is 4.