Triangles Shapes with 3 sides! Equilateral Triangle All 3 Sides are equal in Length All 3 interior angles are the same.

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Presentation transcript:

Triangles Shapes with 3 sides!

Equilateral Triangle All 3 Sides are equal in Length All 3 interior angles are the same

Isosceles Triangle Two Sides of equal Length Two interior angles are the same

Scalene Triangle No Sides of equal Length All interior angles are different

Right-Angled Triangles They have an Interior angle of 90 degrees Right-Angled Triangles can be either Isosceles or scalene triangles Scalene Right Angled TriangleIsosceles Right Angled Triangle

What type of triangle is this?

An Equilateral Triangle

How many lines of symmetry has an Equilateral Triangle got? 1 23

Properties of an Equilateral Triangle  Has 3 equal sides  Has 3 equal angles  Each angle is a 60 o angle  Has 3 lines of symmetry  Is a regular shape

What type of triangle is this?

An Isosceles Triangle

How many lines of symmetry has an Isosceles Triangle got? 1

Properties of an Isosceles Triangle  Has 2 equal sides  Has 2 equal angles  Has 1 line of symmetry  Is an irregular shape

What type of triangle is this?

A Scalene Triangle

None! How many lines of symmetry has a Scalene Triangle got?

Properties of an Scalene Triangle  Has NO equal sides  Has NO equal angles  Has NO lines of symmetry  Is an irregular shape

What type of triangle is this?

A Right Angled Triangle

A Right Angled Triangle is different It may be scaleneor it may be isosceles But it always has a right angle!

Properties of a Right Angled Triangle  Has 1 right angle  May be an isosceles triangle  May have 1 line of symmetry  Is an irregular shape It will be isosceles and have 1 line of symmetry when these 2 sides are equal.