Question

How many quadrilaterals can be formed joining the vertices of a polygon of 9 sides

Answer 1

Explanation:

nanogon can be formed by joining it

Answer 2

Answer: 126.

Explanation:

Now, in simple terms,

we require a total of 4 points to draw a quadrilateral.

Now, when joining the vertices of a polygon, 9 sides means total 9 points among which any 4 will produce a possible quadrilateral.

So, the answer is the possible ways we can choose any 4 points from the 9 points of the polygon we've got.

So, it can be expressed as,

C(9,4) = (9 X 8 X 7 X 6) / (1 X 2 X 3 X 4)

or, C(9,4) = 126.