Ex 7.2, 8 - Show that angles of equilateral triangle are 60 - Ex 7.2

  1. Chapter 7 Class 9 Triangles
  2. Serial order wise
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Ex7.2, 8 Show that the angles of an equilateral triangle are 60 each. Given: ABC be an equilateral triangle. AB = BC = AC To prove: A = B = C = 60 Proof: AB = AC C = B Also, AC = BC B = A From (1) & (2) A = B = C In ABC, A + B + C = 180 A + A + A = 180 3 A = 180 A A A = B = C = 60 Hence proved

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