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  1. Chapter 10 Class 7 Practical Geometry
  2. Serial order wise
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Ex 10.4, 3 Examine whether you can construct ∆DEF such that EF = 7.2 cm, m∠E = 110° and m∠F = 80°. Justify your answer. We know that Sum of angles of a triangle = 180° But here, ∠ E + ∠ F = 110° + 80° = 190° > 180° Since sum of two angles cannot be greater than 180° ∴ Δ DEF is not possible

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.