It will have 5 sides and it is a pentagon.
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A pentagon
Its 5 interior angles add up to 540 degrees
the sum of the interior angles of a 3 sided polygon is = 180 degrees. the sum of the interior angles of any polygon is given by 540/n. in this case n is = 3
The total for the interior angles depends on the number of sides. The formula for the total of interior angles of an n-sided polygon is sum =180(n-2). This is 180 degrees for triangles, 360 degrees for quadrilaterals, and 540 degrees for pentagons.
Pentagon Degrees=180(n-2) n=# of sides