Every closed figure with at least 4 sides has at least 2 diagonals.
Every quadrilateral (figure with exactly 4 sides) has exactly 2 diagonals.
That includes all parallelograms, rhombera, rectangles, squares, trapezoids,
diamonds, and kites, as well as all other irregular quadrilaterals.
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A 4 sided quadrilateral has 2 diagonals.
A triangle has 3 sides and no diagonals
It has 4 interior angles that add up to 360 degrees and 2 diagonals that intersect each other at right angles.
2. To find out how many diagonals are in a figure, just use this equation: n(n-3)/2 where n equals the number of sides therefore: 4(4-3)/2 4(1)/2 4/2 2 diagonals
1/2*(n2-3n) = diagonals when n equals number of sides.