A 3 side polygon is a TRIANGLE.
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A 4-sided polygon has 2 diagonals. A 5-sided polygon, 5. 6-sided, 9. By induction, an n-sided polygon has 'n*(n-3)/2' diagonals. "n" is how many sides a shape has. so, (7)*(7-3)/2 now we have, 7*4/2 so, 28/2 = 14 Therefore, a 7-sided polygon would have 14 diagonals.
A triangle is classified as a 3 sided polygon.
A 10-sided polygon is a decagon.
A pentagon and a quadrilateral, respectively.
A ten-sided polygon is called a decagon.