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 Triangle Isosceles Right Angled Triangle

What type of triangle is this?

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An Equilateral Triangle

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How many lines of symmetry has an Equilateral Triangle got?

1

2 3

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Properties of an Equilateral Triangle

Has 3 equal sides

Has 3 equal angles

Each angle is a 60o angle

Has 3 lines of symmetry

Is a regular shape

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What type of triangle is this?

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An Isosceles Triangle

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How many lines of symmetry has an Isosceles Triangle got?

1Triangles

Properties of an Isosceles Triangle

Has 2 equal sides

Has 2 equal angles

Has 1 line of symmetry

Is an irregular shapeTriangles

What type of triangle is this?

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A Scalene Triangle

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None!

How many lines of symmetry has a Scalene Triangle got?

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Properties of an Scalene Triangle

Has NO equal sides

Has NO equal angles

Has NO lines of symmetry

Is an irregular shapeTriangles

What type of triangle is this?

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A Right Angled Triangle

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A Right Angled Triangle is different

It may be scalene or it may be isosceles

But it always has a right angle!

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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.

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