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− | Geogebra sketch shows formation of a triangle
| + | 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. |
− | http://karnatakaeducation.org.in/KOER/en/images/f/f9/Triangle_formation.png
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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. |
| ===Estimated Time=== | | ===Estimated Time=== |
| + | 30 minutes |
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| === Prerequisites/Instructions, prior preparations, if any === | | === Prerequisites/Instructions, prior preparations, if any === |
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| ===Materials/ Resources needed=== | | ===Materials/ Resources needed=== |
− | #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/bwsvgqqg#material/z4h42k8z Introduction to a triangle.ggb]”'''
| + | *Geogebra files : '''“[https://www.geogebra.org/m/kenedcfx Introduction to a triangle.ggb]”''' |
| + | {{Geogebra|kenedcfx}} |
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| ===Process (How to do the activity)=== | | ===Process (How to do the activity)=== |
− | #Use the geogebra file to illustrate.
| + | *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?
| + | *How many lines are there? Are the lines meeting? |
− | #Are the two lines parallel? How can you say they are parallel or not?
| + | *Are the two lines parallel? How can you say they are parallel or not? |
− | #How many angles are formed at the point of intersection?
| + | *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?
| + | *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?
| + | *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.
| + | *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?
| + | *What are the points of intersection of these three lines called? |
− | #The line segments forming the triangle are called sides.
| + | *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 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''' |
− | [[Category:Mathematics]]
| + | * 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:Triangles]] | | [[Category:Triangles]] |
| + | [[Category:Class 8]] |
| + | [[Category:Classroom activities]] |