NDA Math Mock Test 03 – Question 35

Question:

A polygon has 44 diagonals. The number of its sides is:

एक बहुभुज में 44 विकर्ण होते हैं। इसकी भुजाओं की संख्या है:

Options:

  • 11
  • 10
  • 8
  • 7
  • 11
  • 10
  • 8
  • 7

Correct Answer: a)

Explanation:

The number of diagonals in an \(n\)-sided polygon is given by:
\[D = \frac{n(n – 3)}{2}\]
Given \(D = 44\):
\[\frac{n(n – 3)}{2} = 44 \implies n(n – 3) = 88\]
\[n^2 – 3n – 88 = 0 \implies (n – 11)(n + 8) = 0\]
Since the number of sides \(n > 0\), we get \(n = 11\).
Hence, the correct option is (a).

\(n\) भुजाओं वाले बहुभुज में विकर्णों की संख्या का सूत्र:
\[D = \frac{n(n – 3)}{2}\]
\(D = 44\) रखने पर:
\[n(n – 3) = 88 \implies n^2 – 3n – 88 = 0 \implies (n – 11)(n + 8) = 0\]
चूँकि भुजाओं की संख्या धनात्मक होती है, अतः \(n = 11\)।
अतः सही विकल्प (a) है।

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