If each interior angle of a regular polygon is \({\left( {128\frac{4}{7}} \right)^0}\), then what is the sum of the number of its diagonals and the number of its sides?

If each interior angle of a regular polygon is \({\left( {128\frac{4}

1.	If each interior angle of a regular polygon is \({\left( {128\frac{4}{7}} \right)^0}\), then what is the sum of the number of its diagonals and the number of its sides?
A.	17
B.	19
C.	21
D.	15
Answer» D. 15

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If each interior angle of a regular polygon is \({\left( {128\frac{4}{7}} \right)^0}\), then what is the sum of the number of its diagonals and the number of its sides?

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