Difference between revisions of "Formation of a triangle"
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=== Objectives === | === Objectives === | ||
| − | + | *Understand formation of triangles | |
| − | + | *Recognize elements of triangle | |
| − | + | *Introduce concepts of exterior angle. | |
[[File:Triangle formation.png|thumb|600x600px|'''[https://www.geogebra.org/m/bwsvgqqg#material/z4h42k8z Introduction to a triangle.ggb]''']] | [[File:Triangle formation.png|thumb|600x600px|'''[https://www.geogebra.org/m/bwsvgqqg#material/z4h42k8z Introduction to a triangle.ggb]''']] | ||
| Line 12: | Line 12: | ||
===Materials/ Resources needed=== | ===Materials/ Resources needed=== | ||
| − | + | *Digital : Computer, geogebra application, projector. | |
| − | + | *Non digital : Worksheet and pencil | |
| − | + | *Geogebra files : '''“[https://www.geogebra.org/m/bwsvgqqg#material/z4h42k8z Introduction to a triangle.ggb]”''' | |
===Process (How to do the activity)=== | ===Process (How to do the activity)=== | ||
| − | + | *Use the geogebra file to illustrate. | |
| − | + | *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? | ||
[[Category:Mathematics]] | [[Category:Mathematics]] | ||
[[Category:Triangles]] | [[Category:Triangles]] | ||
Revision as of 03:56, 12 April 2019
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”
Process (How to do the activity)
- Use the geogebra file to illustrate.
- 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?