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  1. Chapter 5 Class 6 Understanding Elementary Shapes
  2. Serial order wise
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Ex 5.6, 1 Name the types of following triangles : (a) Triangle with lengths of sides 7 cm, 8 cm and 9 cm. Classification of triangles On side Equilateral - 3 sides equal Isosceles - 2 sides equal Scalene - All 3 sides different On angles Right angled - One angle 90° Acute angled - All angles less than 90° Obtuse angled - One angled greater than 90° All three sides are different. So, it is a scalene triangle Ex 5.6, 1 Name the types of following triangles : (b) ∆ABC with AB = 8.7 cm, AC = 7 cm and BC = 6 cm. All three sides are different. So, it is a scalene triangle All three sides are different. So, it is a scalene triangle All three sides are same. So, it is an equilateral triangle. Ex 5.6, 1 Name the types of following triangles : (d) ∆DEF with m D ∠ = 90° One angle is 90° So, it is a right-angled triangle Ex 5.6, 1 Name the types of following triangles : (e) ∆XYZ with m Y ∠ = 90° and XY = YZ. One angle is 90° So, it is right angled. Two sides are equal. So, it is a isosceles. ∴ It is isosceles right-angled triangle Ex 5.6, 1 Name the types of following triangles : (f) ∆LMN with m L ∠ = 30°, m M ∠ = 70° and m N ∠ = 80° All three angles are acute, So, it is an acute-angled triangle.

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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.