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Construct a triangle with sides - 3 cm, 4 cm, and 8 cm
Last updated at November 5, 2025 by Teachoo
Class 7 (Ganita Prakash & Old NCERT)
Chapter 7 Class 7 - A tale of three Intersecting Lines (Ganit Prakash)
- Definition
- Constructing Equilateral Triangle
- Constructing a Triangle when its Sides are given
- Figure it out - Page 150, 151
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Are Triangles Possible for any Lengths?
- Figure it out - Page 154
- Visualising the Construction of Circles
- Figure it out - Page 156
- Triangle Inequality & Construction of Circles
- Figure it out - Page 159
- Constructing Triangle when 2 Sides and the Included Angle are given
- Constructing Triangle when 2 Angles and the Included Side are given
- Do triangles always exist?
- Sum of angles of a triangle
- Angle Sum Property
- Exterior Angles
- Constructions Related to Altitudes of Triangles
- Figure it out - Page 170, 171
Transcript
Construct a triangle with sides - 3 cm, 4 cm, 8 cmFirst we draw a rough sketch Let’s try to draw it now Steps of construction 1. Draw a line segment AB of length 4 cm 2. Since AC = 3 cm. Taking 3 cm as radius, and A as center, we draw a full circle lightly 3. Since BC = 8 cm. Taking 8 cm as radius, and B as center, we draw a full circle lightly We note that that the two circles do not intersect So, the triangle is not possible But – Is there a way to figure out a triangle is possible without drawing circles? Let’s answer that
