Interior Angles

sum of interior angles:

interior angles sum for any polygon can be obtained by using the formula,

180(n-2)

where n is the number of sides for the polygon.
The number of sides for a decagon is 10.
The sum of interior angles of a decagon can be determined by substituting n = 10 in the formula.
The sum of interior angles of a decagon = 180(10-2)

= 180(8)

= 1440°
Sum of interior angles of a decagon
Therefore the sum of interior angles of a decagon is 1440°.

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