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How many quadrilaterals can be formed from a convex polygon with (12) sides?

Answer and explanation

Correct answer: 495

Every selection of 4 vertices of a convex 12-sided polygon determines exactly one quadrilateral. Therefore, the required number is \(\binom{12}{4}=495\). Since the order of selecting vertices does not matter, combinations—not permutations—are used. For instance, 450 equals \(\binom{10}{2}\), which does not represent choosing 4 vertices here. Exam tip: The number of quadrilaterals formed from a convex \(n\)-gon is \(\binom{n}{4}\).

Related tags

CombinationsConvex PolygonQuadrilateralsNcrPermutations And CombinationsMathematicsClass 11 Mcq

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