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Ex 8.1, 1 - The angles of quadrilateral are in ratio 3 5 9 13 - Definations

  1. Chapter 8 Class 9 Quadrilaterals
  2. Serial order wise
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Ex 8.1, 1 The angles of quadrilateral are in the ratio 3 : 5 : 9 : 13. Find all the angles of the quadrilateral. Let angles in the ratio 3: 5: 9: 13 be a, b, c & d Let a = 3x , b = 5x , c = 9x, d = 13x where x is any number We know that Sum of angles of a quadrilateral is 360° , a + b + c + d = 360° 3x + 5x + 9x + 13x = 360° 30x = 360° x = ("360" °)/"30" x = 12° Hence, the angles are a = 3x  = 3 × 12° = 36° b = 5x  = 5 × 12° = 60° c = 9x  = 9 × 12° = 108° d = 13x = 13 × 12° = 156°

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He provides courses for Mathematics from Class 9 to 12. You can ask questions here.
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