work it out it is not hard 180(n-2)
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It has 540 degrees because a five sided polygon has three triangles in it, and sinnce a triangle equals 180 degrees, 3 x 180= 540.
The degrees in a 19 sided polygon add up to 3,060 degrees
You see how many triangles fit into the shape and multiply by 180 degrees
The interior angles of an 11 sided polygon add up to 1620 degrees
A 10 sided decagon polygon has 10 interior angles that add up to 1440 degrees.