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Similar and congruent triangles (view source)
Revision as of 06:31, 6 February 2020
, 06:31, 6 February 2020no edit summary
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''[http://karnatakaeducation.org.in/KOER/index.php/ತ್ರಿಭುಜಗಳ_ಸರ್ವಸಮತೆ ಕನ್ನಡದಲ್ಲಿ ನೋಡಿ]''</div>
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[[File:similar_and_congruent_triangles.mm]]
[[File:similar_and_congruent_triangles.mm]]
Here is the concept map of Congruency of triangle
[[File:CONGRUENCY OF TRIANGLE.mm|Flash]]
=== Additional Resources ===
=== Additional Resources ===
*Web resources:
*Web resources:
**This videos is related congruence of triangle.
**This videos is related congruence of triangle.
{{#widget:YouTube|id=HwbTJNcZsuc}} {{#widget:YouTube|id=PJ6TVVdIHpg}}
{{#widget:YouTube|id=HwbTJNcZsuc}} {{#widget:YouTube|id=PJ6TVVdIHpg}} {{#widget:YouTube|id=5of3Z9hr_7A}}
{{#widget:YouTube|id=mFpvOZP4aPI}}
*Books and journals
*Books and journals
====Non-OER====
====Non-OER====
*Web resources:
*Web resources:
**[https://www.mathsisfun.com/geometry/triangles-congruent-finding.html Math is fun]
**[https://www.mathsisfun.com/geometry/triangles-congruent-finding.html Math is fun] : This website gives descriptions and diagrams related to rules of congruency
*Books and journals
*Books and journals
====== [[Identifying congruent shapes]] ======
====== [[Identifying congruent shapes]] ======
Polygons are congruent if they are the same size and shape that is, if their corresponding angles and sides are equal. The activity helps in identifying congruent shapes.
====== [[Shapes that are congruent]] ======
====== [[Shapes that are congruent]] ======
Shapes can be combined together to form congruent shapes. Identifying such shapes for congruence is explored in this activity.
====== [[Congruence of regular geometric shapes]] ======
====== [[Congruence of regular geometric shapes|Congruence of geometric shapes]] ======
<span></span><span></span>
This activity involves in identifying the congruent shapes among the shapes of different geometric shapes.<span></span><span></span>
====Concept # 2. Postulates for congruence of triangles.====
====Concept # 2. Postulates for congruence of triangles.====
Any triangle is defined by six measures (three sides, three angles). Triangles are congruent if:
Any triangle is defined by six measures (three sides, three angles). Triangles are congruent if:
# A pair of corresponding angles and a non-included side are equal.-- AAS (angle angle side) congruency postulate.
# A pair of corresponding angles and a non-included side are equal.-- AAS (angle angle side) congruency postulate.
# HL (hypotenuse leg of a right triangle) :Two right triangles are congruent if the hypotenuse and one leg are equal.Also known as RHS postulate.
# HL (hypotenuse leg of a right triangle) :Two right triangles are congruent if the hypotenuse and one leg are equal.Also known as RHS postulate.
=====Activities=====
=====Activity 1=====
====== [[Congruence in triangles – SSS Rule]] ======
====== [[Congruence in triangles – SSS Rule]] ======
Investigating the possibility of congruence if three sides of two triangles are congruent.
===== Activity 2 =====
====== [[Congruence in triangles – SAS Rule]] ======
====== [[Congruence in triangles – SAS Rule]] ======
<span></span><span></span>
Given two sides and an angle of two triangles are equal, are the two triangles congruent? This activity investigates the position of the given angle for the two triangles to be congruent. <span></span><span></span>
====Concept # 4 What are similar triangles?====
====Concept # 4 What are similar triangles?====
=====Activities =====
Triangles are similar if corresponding sides are in the same ratio and corresponding angles are equal. All regular polygons having the same number of sides are always similar. All squares and equilateral triangles are similar. All congruent figures are similar but all similar figures need not be congruent.
=====Activities # =====
====== [[Introduction to similar triangles|Introduction to similar triangles]] ======
====== [[Introduction to similar triangles|Introduction to similar triangles]] ======
Concept of similarity is introduced and investigated by comparing elements of two triangles.
==== Concept # 5. Tests for similarity ====
==== Concept # 5. Tests for similarity ====
# SAS Similarity Postulate states, “If an angle of one triangle is congruent to the corresponding angle of another triangle and the sides that include this angle are proportional, then the two triangles are similar.”
# SAS Similarity Postulate states, “If an angle of one triangle is congruent to the corresponding angle of another triangle and the sides that include this angle are proportional, then the two triangles are similar.”
=====Activities=====
=====Activities #=====
======[[Similarity test - AA postulate]]======
======[[Similarity test - AA postulate]]======
In two triangles, if the angles are equal, then the sides opposite to the equal angles are in the same ratio and hence the two triangles are similar.
==== Solved problems/ key questions (earlier was hints for problems). ====
=== Projects (can include math lab/ science lab/ language lab)[edit | edit source] ===
=== Projects (can include math lab/ science lab/ language lab) ===
=== Assessments - question banks, formative assessment activities and summative assessment activities ===
=== Assessments - question banks, formative assessment activities and summative assessment activities ===
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[[Category:Triangles]]
[[Category:Class 8]]
[[Category:Class 9]]