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Find the number of triangles in a heptagon if drawn from a single vertex.
Given: A heptagon.
To do: To find the number of triangles in a heptagon if drawn from a single vertex.
Solution:
If a polygon has $n$ sides then,
Number of triangles in the polygon drawn from a single vertex$=n-2$
Here we have a heptagon, thus $n=7$.
$\therefore$ Number of triangles in a heptagon$=n-2=7-2=5$
Thus, there are $5$ triangles in a heptagon drawn from a single vertex.
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