All about Shapes.

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All about Shapes.

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Presentation transcript:

All about Shapes

Properties of Shapes Number of sides Number of angles Number of lines of symmetry Regular or irregular Right Angles Parallel lines

Shapes Key Words Triangles Polygons Regular Shapes

Triangles Shapes with 3 sides!

What type of triangle is this?

An Equilateral Triangle

How many lines of symmetry has an Equilateral Triangle got? 1 2 3

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

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

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

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 scalene or 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.

Key Words Regular Shape Parallel Perpendicular Vertex Diagonal Bisect

Regular Shape Shapes are regular when All their sides are the same length All their angles are the same size

when they are always the same distance apart. Parallel Lines are parallel when they are always the same distance apart.

when they meet at right angles. Perpendicular Lines are perpendicular when they meet at right angles.

Vertex A Vertex is a corner of a shape where two lines meet.

Diagonal A Diagonal is a straight line that joins one corner (vertex) of a shape to a non adjacent corner (vertex)

Bisect A line that cuts a shape exactly in half, Bisects the shape

Polygons Shapes with many sides!

What shape is this?

A Hexagon

How many lines of symmetry has a Hexagon? 4 1 2 5 6 3

Properties of a Regular Hexagon Has 6 equal sides Has 6 equal angles Has 6 lines of symmetry

What shape is this?

A Pentagon

How many lines of symmetry has a Pentagon? 1 3 4 5 2

Properties of a Regular Pentagon Has 5 equal sides Has 5 equal angles Has 5 lines of symmetry

Polygons Shapes with many sides!

Lines of Symmetry - Look at these shapes Can you suggest a rule?

How many lines of symmetry? Look at these shapes Heptagon Octagon How many lines of symmetry?

Lines of symmetry Heptagon Octagon 7 8