Difference between revisions of "Triangles"
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=Learning Objectives= | =Learning Objectives= | ||
==Teaching Outlines== | ==Teaching Outlines== | ||
| − | + | ||
| − | + | == Concept #1. Formation of a Triangle, elements of a triangle and its measures == | |
| − | ==== | + | # A triangle is a three sided closed figure. |
| − | + | # It is one of the basic shapes in geometry. | |
| − | + | # It triangle is a polygon with three edges and three vertices. | |
| − | + | # There are three angles in a triangle formed at the three vertices of the triangle. | |
| − | Pre-requisites | + | # Interior and exterior angles in a triangle at a vertex, together form a linear pair. |
| − | Resources needed | + | |
| − | How to do the | + | ==== '''Activity No # 1 : Formation of a triangle''' ==== |
| − | Evaluation at the end of the activity | + | [[File:Triangle formation.png|thumb|Formation of a triangle]] |
| − | + | * '''Objectives''' | |
| − | + | # Understand formation of triangles | |
| − | + | # Recognize elements of triangle | |
| + | # Introduce concepts of exterior angle. | ||
| + | * '''Pre-requisites''' | ||
| + | Prior knowledge of point, lines, angles, parallel linesResources needed | ||
| + | * '''Resources needed''' | ||
| + | # Digital : Computer, geogebra application, projector. | ||
| + | # Non digital : Worksheet and pencil | ||
| + | # Geogebra files : “[https://www.geogebra.org/m/smnvwasa 1.Introduction to a triangle.ggb]” | ||
| + | * '''How to do''' | ||
| + | # 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? | ||
[[Category:Triangles]] | [[Category:Triangles]] | ||
[[Category:Class 9]] | [[Category:Class 9]] | ||
Revision as of 15:19, 27 January 2019
Concept Map
Additional Resources
OER
- List web resources with a brief description of what it contains; how it can be used and whether it can be by teacher/ student or both
- Books and journals
- Textbooks
- Syllabus documents
Non-OER
- List web resources with a brief description of what it contains; how it can be used and whether it can be by teacher/ student or both
- Books and journals
- Textbooks
- Syllabus documents
Learning Objectives
Teaching Outlines
Concept #1. Formation of a Triangle, elements of a triangle and its measures
- A triangle is a three sided closed figure.
- It is one of the basic shapes in geometry.
- It triangle is a polygon with three edges and three vertices.
- There are three angles in a triangle formed at the three vertices of the triangle.
- Interior and exterior angles in a triangle at a vertex, together form a linear pair.
Activity No # 1 : Formation of a triangle
- Objectives
- Understand formation of triangles
- Recognize elements of triangle
- Introduce concepts of exterior angle.
- Pre-requisites
Prior knowledge of point, lines, angles, parallel linesResources needed
- Resources needed
- Digital : Computer, geogebra application, projector.
- Non digital : Worksheet and pencil
- Geogebra files : “1.Introduction to a triangle.ggb”
- How to do
- 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?