जर एका नियमित बहूभुजाकृतीचा प्रत्येक अंतर्गत कोन 135° आहे, तर त्या बहूभुजाकृतीच्या कर्णांची संख्या किती?

  1. 12
  2. 14
  3. 16
  4. 20

Answer (Detailed Solution Below)

Option 4 : 20
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नियमित बहूभुजाकृतीचा प्रत्येक अंतर्गत कोन 135° आहे,

⇒ बाह्य कोन = 180° - अंतर्गत कोन = 45°

⇒ बहूभुजाकृतीच्या बाजूंची संख्या = 360°/बाह्य कोन = 8

∴ कर्णांची संख्या = n(n - 3)/2 = 8 × (8 - 3)/2 = 20, जिथे n ही बहूभुजाकृतीच्या बाजूंची संख्या आहे.
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