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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


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


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An octagon has 8 sides and 8 angles.


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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.


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