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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.

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Q: How many diagonals does a shape with 8 sides have?
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Related questions

How many sides and diagonals are there in an octagon?

Sides: 8 Diagonals : 20


What is a shape with 8 sides 8 angles and 20 diagonals?

It is an 8 sided octagon


How many diagonals are in a six sided shape?

8


How many side does a octagon with 35 diagonals have?

An octagon has 8 sides and 20 diagonals so the question doesn't make sense


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.


What is the shape that has 8 sides?

The Shape That Has 8 Sides Is A Octagon Which Has 8 Equal Sides


How many sides is an octagon shape?

8


What Shape has 8 sides 8 angles?

An octagon has 8 sides and 8 angles.


How many triangles will be formed if you draw diagonals from a single vertex of a convex polygon with 8 sides?

It is: 8-2 = 6 triangles


How many diagonals does a concave hexagon have?

A concave Hexagon is that hexagon which has one of its internal angle greater than 180 degrees. It can have 8 diagonals. As compared to regular hexagon (Also convex hexagon) it has one less number of diagonals. This is because one line joining two of its vertices (that are at the end of sides forming >180 angle) fall outside the hexagon.


How many diagonals does a octagon has?

20 diagonals For any n-sides polygon, the formula for the number of diagonals is (n/2) x (n-3), so for an octagon it is (8/2) x (8-3) = 4 x 5 = 20.


What shape has twice as many sides as a square?

A Square has 4 sides, the shape you want that has twice as many sides as this is called a Octagon. ( Oct = 8 - as in Octopus ).