Triangles

How many triangles can you count in this picture?

Are they the same?

A triangle is a closed figure with three sides.

What is it?

Parts of a triangle

It has three sides and three angles

The three angles always add to 180°

HOW CAN WE CLASSIFY THEM?

Triangles

Sides

Equilateral

Isosceles

Scalene

Angles

Acute

Right

Obtuse

Can be classified according to their

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:

No equal sides No equal angles

c)Scalene Triangle

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

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Now….. Time to practice