Difference between revisions of "Formation of a triangle"
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| − | + | Introducing formation of a shape with least number of lines and the space enclosed by these lines form a geometric shape.The key geometric concepts that are related with this are explained. | |
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=== Objectives === | === Objectives === | ||
*Understand formation of triangles | *Understand formation of triangles | ||
*Recognize elements of triangle | *Recognize elements of triangle | ||
*Introduce concepts of exterior angle. | *Introduce concepts of exterior angle. | ||
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===Estimated Time=== | ===Estimated Time=== | ||
30 minutes | 30 minutes | ||
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*Digital : Computer, geogebra application, projector. | *Digital : Computer, geogebra application, projector. | ||
*Non digital : Worksheet and pencil | *Non digital : Worksheet and pencil | ||
| − | *Geogebra files : '''“[https://www.geogebra.org/m/ | + | *Geogebra files : '''“[https://www.geogebra.org/m/kenedcfx Introduction to a triangle.ggb]”''' |
| + | {{Geogebra|kenedcfx}} | ||
===Process (How to do the activity)=== | ===Process (How to do the activity)=== | ||
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* What will happen if the three vertices are collinear? | * What will happen if the three vertices are collinear? | ||
[[Category:Triangles]] | [[Category:Triangles]] | ||
| + | [[Category:Class 8]] | ||
| + | [[Category:Classroom activities]] | ||
Latest revision as of 11:29, 10 May 2019
Introducing formation of a shape with least number of lines and the space enclosed by these lines form a geometric shape.The key geometric concepts that are related with this are explained.
Objectives
- Understand formation of triangles
- Recognize elements of triangle
- Introduce concepts of exterior angle.
Estimated Time
30 minutes
Prerequisites/Instructions, prior preparations, if any
Prior knowledge of point, lines, angles, parallel lines
Materials/ Resources needed
- Digital : Computer, geogebra application, projector.
- Non digital : Worksheet and pencil
- Geogebra files : “Introduction to a triangle.ggb”
Download this geogebra file from this link.
Process (How to do the activity)
- Use the geogebra file to illustrate. The questions below will are used to interact with the geogebra sketch.
- How many lines are there? Are the lines meeting?
- Are the two lines parallel? How can you say they are parallel or not?
- How many angles are formed at the point of intersection?
- What is the measure of the total angle at the point of intersection of two lines?
- Of the four angles formed which of the angles are equal? What are they called?
- Do the three intersecting lines enclose a space? How does it look? It is called a triangle.
- What are the points of intersection of these three lines called?
- The line segments forming the triangle are called sides.
- How many angles are formed when three lines intersect with each other?
- How many angles are enclosed by the triangle?
Evaluation at the end of the activity
- Can there be a closed figure with less than three sides?
- Can the vertices of the triangle be anywhere on a plane?
- What will happen if the three vertices are collinear?