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Question 2 - Figure it out (Page 142) - Construction Methods in Śulba-Sūtras - Chapter 6 Class 7 - Constructions and Tilings (Ganita Prakash II)
Last updated at February 6, 2026 by Teachoo
Class 7 (Ganita Prakash 1, 2 & old NCERT)
Chapter 6 Class 7 - Constructions and Tilings (Ganita Prakash II)
- Constructing an Eye
- Constructing a Perpendicular Bisector
- Constructing angle 90°
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Construction Methods in Śulba-Sūtras
- Constructing Angle Bisectors
- Figure it out - Pag 144, 145
- Constructing Copy of an Angle
- Construction of a Line Parallel to the Given Line
- Constructing Arch Designs
- Constructing Regular Hexagon, Angle 60° and 6-pointed Star
- Figure it out - Pag 154, 155
- Tangrams
- Tiling
- Figure it out - Page 160
- Tiling the Entire Plane
Transcript
Question 2 - Figure it out (Page 142) Can you think of different methods to construct a 90° angle at a given point on a line using a rope?We can use the 3-4-5 Method The 3-4-5 Method: Ancient builders also used a special trick with numbers. If you take a rope and mark knots at distances of 𝟑 units, 𝟒 units, and 𝟓 units, and then stretch it into a triangle, The corner between the " 3 " side and the " 4 " side will always be a perfect 90^∘ angle (a right angle). This is actually the Pythagorean theorem in action! We follow these steps Step 1: Lay a rope flat with knots at lengths 4 units and 3 units Step 2: Bend the rope at the knot to form a corner Step 3: Connect the ends with a 5-unit rope (or rod) Result: The 3-4-5 triangle gives a perfect 90° angle
