SOLUTION: What is a polygon called if the sum of its interior angles is 6840

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Question 958600: What is a polygon called if the sum of its interior angles is 6840
Answer by MathLover1(20850) About Me  (Show Source):
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the formula for the sum of the interior angles (S) of a regular polygon of n-sides:
S+=+%28n-2%29180
if given that S+=++6840, then we have
6840+=+%28n-2%29180 ...solve for n
6840%2F180+=+%28n-2%29180%2F180
38+=+n-2
38%2B2+=+n
n=40 a polygon called tetracontahedron+