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TRIANGLES
Teacher Victor
Let's investigate!
- Surita has made a triangle using a length of string.
My triangle is equilateral. I measured one side. It is 4cm long.
How long is her piece of string?
- George has made a triangle using a different length of string.
Investigation
My triangle is isosceles. I measured two sides. One is 4cm and one is 5cm.
How long could this piece of string be?
A
Types of triangles
B
Vocabulary
- Equilateral triangle (A) : A triangle with all angles equal and all sides equal.
- Isosceles Triangle(B) : A triangle with two angles equal and two sides equal.
- Scalene Triangle(C) : A triangle with no angles equal and no sides equal.
- Right-Angled Triangle(D) : A triangle where one of the angles is a tight angle.
D
C
A Noticeboard
- The following noticeboard has been divided into 12 sections labeled A to L. Each section contains a set of three pins. Imagine joining these pins using three straight lines:
Activity
I
Which sets of pins will make:
- An equilateral triangle?
- Scalene triangle?
- An isosceles triangle?
- Do any sets of pins not make a triangle?
Finding triangles
Activity
II
(A) How many equilateral triangles can you find in this diagram?
(b) Can you find any triangles in the diagram that are not equilateral?
(c) Mark used 15 cm of string to make one of the small triangles in the diagram. What length of string does he need to make the largest triangle?
True or False?
A. All triangles have 3 sides.
B. The two sides that are same length in an isosceles triangle are longer than the other side.
3.Triangle can be isosceles and right-angle.
4.None of the sides of a scalene triangle are the same length.
5.All triangles have three lines of reflective symmetry.