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you subtract 3 from the number of sides then multiply that by the number of sides divided by 2

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Q: How do you find the number of diagonals in a shape?
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Related questions

How many diagonals are there in a 18 sided shape?

Number of diagonals = 18*(18-3)/2 = 135


How many diagonals are in a shape?

n(n - 3)/2. where n is the number of sides in the shape


How many diagonals does an octahedron have?

An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. The number of diagonals will depend on the precise shape.


How many diagonals does shapes have?

It depends on the shape. A square has no diagonals.Improved Answer:-A square has 2 diagonals in common with all other quadrilateralsThe formila is: 0.5*(n2-3n) = diagonals whereas n in the formula represents the number of sides the polygon or shape has


What shape has 2 diagonals?

Any quadrilateral (4-sided shape) has 2 diagonals.


How many diagonals does a shape with 5 sides have?

5(5-3)/2. That it is the formula so that shape would have 5 diagonals. n(n-3)/2 where n is the number of sides


How many diagonals make a shape rigid?

The answer depends on whether the shape is 2-dimensional or 3-d. For a 2-dimensional polygon with n sides, the minimum number is n-3 diagonals.


How do you find out how many diagonals a shape has?

You connect the points that it has, corner to corner and count them. Moo


How many diagonals does a 10 sided shape have?

35 diagonals


How yo find the formula on how to solve the number of diagonals in a polygon?

It is: 0.5*(n2-3n) = diagonals whereas 'n' is the number of sides of the polygon


How do you find an area of a quadratic shape when you have the size of diagonals but the size of all four sides are different?

Inless you know at what angle the diagonals meet, there is no single answer to your question!


Where d is the number of diagonals of a polygon with n sides find d if equals 20?

1/2*(n2-3n) = number of diagonals 1/2*(202-60) = 170 diagonals