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You are here: Home » GMAT Test Prep Questions » Geometry » Question 6
Data Sufficiency   GMAT Problem Solving : Geometry, Number of Diagonals
The GMAT Math practice question is a geometry problem to find the number of diagonals of an n-sided convex polygon.

Question 6
How many diagonals does a 63-sided convex polygon have?
  1. 3780
  2. 1890
  3. 3843
  4. 3906
  5. 1953
The correct choice is (B) and the correct answer is 1890 diagonals.

Explanatory Answer
The number of diagonals of an n-sided convex is n(n-3)/2

This polygon has 63 sides. Hence, n = 63

Therefore, number of diagonals = 63*60/2 = 1890

eBook   GMAT Math eBook on Geometry
Geometry, Solid Geometry, Co-ordinate Geomerty eBook @ USD 6.99

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The book contains 50+ solved examples and illustrative examples. In addition, the eBook contains 60+ exercise questions covering a wide variety of questions from these three topics for you to practise.

USD 6.99Buy NowDetails on Geometry eBookeBook Faq
 


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