Difference between revisions of "Formation of a triangle"
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| − | Geogebra sketch shows formation of a triangle | + | Geogebra sketch shows formation of a triangle |
=== Objectives === | === Objectives === | ||
| Line 5: | Line 5: | ||
#Recognize elements of triangle | #Recognize elements of triangle | ||
#Introduce concepts of exterior angle. | #Introduce concepts of exterior angle. | ||
| + | |||
| + | http://karnatakaeducation.org.in/KOER/en/images/f/f9/Triangle_formation.png | ||
===Estimated Time=== | ===Estimated Time=== | ||
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#How many angles are formed when three lines intersect with each other? | #How many angles are formed when three lines intersect with each other? | ||
#How many angles are enclosed by the triangle? | #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 10:30, 11 April 2019
Geogebra sketch shows formation of a triangle
Objectives
- Understand formation of triangles
- Recognize elements of triangle
- Introduce concepts of exterior angle.
Estimated Time
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?