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Last updated at Sept. 29, 2018 by Teachoo

Transcript

Constructing a Triangle when 2 sides, and 1 angle between them is known (SAS) Let’s take an example Draw a triangle Δ ABC, with AB = 3 cm, ∠ A = 30° and AC = 4 cm First we draw a rough sketch We follow these steps Steps of construction 1. Draw a line segment AB of length 3 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. Taking A as center, 4 cm as radius, we draw an arc Let the point where arc intersects the ray be point C 4. Join BC and label the sides Thus, Δ ABC is the required triangle

Constructing a triangle when 2 sides and angle between is known (SAS)

Chapter 10 Class 7 Practical Geometry

Concept wise

- Construction of line parallel to given line, through point not on line
- Constructing a triangle when 3 sides known (SSS)
- Constructing a triangle when 2 sides and angle between is known (SAS)
- Constructing a triangle when 2 angles and side between is known (ASA)
- Constructing a right triangle when hypotenuse and side is given (RHS)

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.