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If each interior angle of a regular poly...

If each interior angle of a regular polygon is `(128 4/7)^@` , then what is the sum of the number of its diagonals and the number of its sides?

A

15

B

19

C

17

D

21

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If each interior angle of a regular polygon is (128 4/7)^@ , then what is the sum of the number of its diagonal and the number of its sides? /यदि किसी सम बहुभुज का प्रत्येक आतंरिक कोण (128 4/7)^@ है, तो इसके विकर्णों की संख्या और इसकी भुजाओं की संख्या का योग ज्ञात करें |

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