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The number of diagonals in an equilateral figure can be calculated from the number of sides.
If the number of sides is "S", then the number of diagonals would be S(S-3)/2
This becomes clear if you consider that there will be the same number of vertices as there are sides. From each vertex you can draw a diagonal to all vertices except the one you started from and the two adjacent ones (lines between the adjacent vertices and the starting point are sides of the figure, not diagonals). This gives you S·(S-3) but that would double count the diagonals since each diagonal can start at either vertex.
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How many diagonals dose a equilateral triangle?
None. Triangles - whether equilateral or not - do not have diagonals
How many diagonals does an equilateral triangle have?
Triangles have 0 diagonals.
How many diagonals are there in an 20-sided figure have?
There are 170 diagonals
How many diagonals with a three side figure?
Diagonals connect corners of a figure. If you try to connect two corners of a three sided figure, the lines you draw will exactly mimic the sides of the figure. Because of this, a three sided figure has no diagonals.
How many diagonals does a 16 sided figure have?
0.5*(162-48) = 104 diagonals
How many diagonals does a 25 sided figure have?
0.5*(252-75) = 275 diagonals
How many diagonals has a 4 sided figure?
A 4 sided quadrilateral has 2 diagonals.
How many diagonals are there in a 15-sided figure?
1/2*(152-45) = 90 diagonals
How many diagonals a four-sided figure can have?
9
How many diagonals does a nine sided figure have?
7
How many diagonals are in a 15 sided figure?
90
How many diagonals does an 12 sided figure have?
54
