Difference between revisions of "Congruence in triangles – SSS Rule"
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| + | Investigating the possibility of congruence if three sides of two triangles are congruent. | ||
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=== Objectives === | === Objectives === | ||
Compare sides in triangles to check for congruence | Compare sides in triangles to check for congruence | ||
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#Digital : Computer, geogebra application, projector. | #Digital : Computer, geogebra application, projector. | ||
#Non digital : Worksheet and pencil, triangles of same and different shapes | #Non digital : Worksheet and pencil, triangles of same and different shapes | ||
| − | #3. Geogebra files : “[https://ggbm.at/ | + | #3. Geogebra files : “'''[https://ggbm.at/pm6ecjsd SSS congruence.ggb]'''” |
| + | {{Geogebra|pm6ecjsd}} | ||
===Process (How to do the activity)=== | ===Process (How to do the activity)=== | ||
Prior hands on activity | Prior hands on activity | ||
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*They can name the vertices in the given triangles. | *They can name the vertices in the given triangles. | ||
*Write down the sides and angles that are coinciding in the two triangles. | *Write down the sides and angles that are coinciding in the two triangles. | ||
| − | Use the geogebra file | + | Use the geogebra file |
*How many triangles you observe? | *How many triangles you observe? | ||
*Are all the triangles same, point out the triangles that are same. | *Are all the triangles same, point out the triangles that are same. | ||
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[[Category:Triangles]] | [[Category:Triangles]] | ||
| + | [[Category:Class 8]] | ||
Latest revision as of 16:32, 30 October 2019
Investigating the possibility of congruence if three sides of two triangles are congruent.
Objectives
Compare sides in triangles to check for congruence
Estimated Time
30 minutes
Prerequisites/Instructions, prior preparations, if any
Prior knowledge of point, lines, angles, closed figures
Materials/ Resources needed
- Digital : Computer, geogebra application, projector.
- Non digital : Worksheet and pencil, triangles of same and different shapes
- 3. Geogebra files : “SSS congruence.ggb”
Download this geogebra file from this link.
Process (How to do the activity)
Prior hands on activity
- Three triangles are distributed to groups of students.
- Children should identify the triangles that are congruent.
- They can name the vertices in the given triangles.
- Write down the sides and angles that are coinciding in the two triangles.
Use the geogebra file
- How many triangles you observe?
- Are all the triangles same, point out the triangles that are same.
- How can you say they are same? What can you do to check if the two triangles are congruent?
- What parameters of triangles are required to know if they are congruent?
- What about the third triangle is it the same as the other two, what you should do to show the triangle is same as the others – concept pf reflection can be discussed
HW:
- Make two triangles of same sizes. Cut it and verify they are congruent.
- Construct one triangle – Base = 3, 4 and 5 are other sides. Another triangle base = 5; and two sides are 3 and 4. Another triangle base = 4; and two sides are 3 and 5. Does the order of sides matter in a triangle?
Evaluation at the end of the activity
- Students should be able to understand, if 3 corresponding sides of two triangles are same then the triangles are congruent.
- Students should also understand that the sequence of sides examined in the triangles need not be same for the triangles to be congruent.