Triangles
How many triangles can you count in this picture?
Are they the same?
What is it?
A triangle is a closed figure with three sides.
Parts of a triangle
It has three sides and three angles
The three angles always add to 180°
HOW CAN WE
CLASSIFY THEM?
Triangles
Can be classified according to their
Sides
Angles
Equilateral
Acute
Isosceles
Right
Scalene
Obtuse
Acording to their sides:
a) Equilateral triangle
Three equal sides
Three equal angles,
always 60°
b) Isosceles Triangle
Two equal sides
Two equal angles
Acording to their sides:
c)Scalene Triangle
No equal sides
No equal angles
Acording to their angles:
a) Acute Triangle
All angles are less than 90°
B) Right Triangle
Has a right angle (90°)
Acording to their sides:
C) Obtuse Triangle
Has an angle more than 90
Now….. Time to practice
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