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  1. Chapter 10 Class 7 Practical Geometry
  2. Concept wise
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Constructing a Triangle when 2 angles, and 1 side between them is known (ASA) Let’s take an example Draw a triangle Δ ABC, with ∠ A = 30° , ∠ B = 60° and AB = 4 cm First we draw a rough sketch We follow these steps Steps of construction 1. Draw a line segment AB of length 4 cm 2. Now, we draw 30° from point A Check Ex 11.1, 3 (i) of Chapter 11 Class 9 NCERT to see how to draw 30° 3. Now, we draw 60° from point B Check Construction 11.3 of Chapter 11 Class 9 NCERT to see how to draw 60° 4. Let point C be the point where the two rays intersect and label the sides Thus, Δ ABC is the required 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.