There is 540 in a pentagon.
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The interior angles of a pentagon sum to 540 degrees.
The word pentagon is from the Greek word "penta" meaning five. A pentagon consists of five sides and will have angles of 108 degrees.
A pentagon has roatotional symmetry only if it is a regulat pentagaon. In that case, it has a rotational symmetry of 360/5 degrees and its multiples. That is, 72, 144, 216, and 288 degrees.
The formula is (s-2) × 180, where s= the number of sides. A pentagon has 5 sides. (5-2) × 180 = 540 degrees.
Each interior angle of a pentagon is 108 degrees. 108 degrees