All quadrilaterals (four sided shapes) have 2 diagonals.
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Any quadrilateral (4-sided shape) has 2 diagonals.
There is none. A 5 sided shape is a pentagon but that has 10 diagonals, not 2.
A hexagon has more than 2 diagonals. -♥Paulina
A nanogon has no diagonals because there is no such shape. A nonagon, on the other hand, has 9*(9-3)/2 = 27 diagonals.
The formula for determining the number of diagonals in a shape is n(n-3)/2 where n=vertices, (corners or intersections of geometric shapes). For an eight sided shape we replace n with 8. 8(8-3)/2 8(5)/2 (8x5)/2 40/2=20 An octagon contains 20 diagonals. For a further example we can determine the diagonals in a shape with 5 sides: 5(5-3)/2 5(2)/2 (5x2)/2 10/2=5 A Pentagon contains 5 diagonals.