Difference between revisions of "Congruence in triangles – SAS Rule"
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*Students should understand if two sides are given the angle should be included for the triangles to be congruent. | *Students should understand if two sides are given the angle should be included for the triangles to be congruent. | ||
*Students should be able to compare the parameters given to check for congruence | *Students should be able to compare the parameters given to check for congruence | ||
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Revision as of 09:45, 16 April 2019
Objectives
- Compare given sides and angles to check for triangle congruency
- Understand the angle given should be included angle
Estimated Time
30 minutes
Prerequisites/Instructions, prior preparations, if any
Prior knowledge of point, lines, angles, elements of triangle, close figures
Materials/ Resources needed
- Digital : Computer, geogebra application, projector.
- Non digital : Worksheet and pencil.
- Geogebra files : “2.SAS congruency.ggb”
Process (How to do the activity)
- If one side is fixed and an angle is fixed will the two triangles be congruent?
- How many triangles can be possible for a given side and a given angle?
- What is the other parameter that needs to be fixed?
- If two sides are congruent in two triangles will the triangles be congruent.
- Do you need another parameter for the two triangles to be congruent. What other parameter is required - Angle / Side
- If another side is fixed – which rule of congruency does it become?
- Which other angle is required to be fixed for the two triangles to be congruent?
- HW : Construct two triangles with one side and one angle same. Check if they are
Evaluation at the end of the activity
- Students should understand if two sides are given the angle should be included for the triangles to be congruent.
- Students should be able to compare the parameters given to check for congruence