write the formula to find the sum of the measure of interior angle of a polygon find the number of sides 10 ,
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1440 Degrees
You can divide a convex polygon into non-overlapping triangles by drawing all the diagonals of the polygon from a single point. When you do this you will get two less triangles than the number of sides. So a 10 sided convex polygon (decagon) will have 8 triangles. Since each triangle has an angle sum of 180 degrees 8 triangles will have an angle sum of 8 X 180 = 1440 degrees.
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