Difference between revisions of "Triangles"
Jump to navigation
Jump to search
Line 14: | Line 14: | ||
==Teaching Outlines== | ==Teaching Outlines== | ||
− | == Concept #1. Formation of a | + | == Concept #1. Formation of a triangle, elements of a triangle and its measures == |
# A triangle is a three sided closed figure. | # A triangle is a three sided closed figure. | ||
# It is one of the basic shapes in geometry. | # It is one of the basic shapes in geometry. |
Revision as of 15:22, 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?