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You count them. In some cases, where the shape has a high degree of symmetry, you can use shortcuts, such as determining that a certain type of triangle repeats several times in a predictable manner.

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Number of triangles in a polygon is number of sides minus 2

Q: How do you find out how many triangles in a shape?

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A nine sided shape has 7 triangles

There are 9 triangles in an 11 sided shape

1o triangles

A dodecagon is a 12 sided shape made from 10 triangles

no triangles

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There are 9 triangles in an 11 sided shape

A nine sided shape has 7 triangles

1o triangles

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A dodecagon is a 12 sided shape made from 10 triangles

no triangles

Such as? If you can break the shape up into triangles you can find the area that way. Or, you can get into calculus-based equations if you have an equation for the random shape.

get a cut out shape of octagon, then get cut out triangles and try to fit in the triangles covering all the octagon but here is the solution... j

The easiest way to find out how many degrees in any shape is 180*(n-2) where n equals the number of angles in the shape. Thus, triangles have 180 degrees.

Originating from one vertex there are 27 triangles

To calculate this, you must find out how many triangles you can draw into the shape. Do this by taking the total number of sides (s) and taking away 2. This leaves you with how many triangles you can draw in the shape (t) from one vertex to another. (Not including outside lines!). Then, multiply the number of triangles in the shape by 180. This leaves you with how many degrees are inside that shape. (a)t = s-2a = t X 180This means there are 1800 degrees in a 12 sided polygon.

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