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Welcome to Llwyncrwn Primary School

Shape

Triangles

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Triangles have three sides. There are many different types of triangles:

Equilateral triangle

  • 3 equal sides

  • 3 equal angles of 60°

An equilateral triangle

Isosceles triangle

  • 2 equal sides

  • 2 equal angles

An Isosceles triangle

Scalene triangle

  • No equal sides

  • No equal angles

A Scalene triangle

Right-angled triangle

  • One of its angles is a right angle (90°)

A Right-angled triangle

Quadrilaterals

 

Quadrilaterals have four sides. Here are some special quadrilaterals:

Square

  • 4 equal sides

  • 4 right angles

Square

Rectangle

  • 2 pairs of equal sides

  • 4 right angles

Rectangle

Rhombus (squashed square)

  • 4 equal sides

  • Opposite sides are parallel

  • Opposite angles are equal

A Rhombus

Parallelogram (squashed rectangle)

  • 2 pairs of equal sides

  • Opposite sides are parallel

  • Opposite angles are equal

A Parallelogram

Trapezium

  • One pair of parallel sides of different lengths

A Trapezium

Kite

  • 2 pairs of equal sides next to each other

  • No parallel sides.

A kite

Circles

 

All circles have a circumference, diameter and radius:

  • The circumference is the distance all the way around a circle.

  • The diameter is the distance right across the middle of the circle.

  • The radius is the distance halfway across the circle. The radius is always half the length of the diameter.

Circle. Radius, circumference and diameter

Polygons

 

Polygons are shapes with many straight sides:

  • Regular polygons have equal angles and sides of equal length.

  • Irregular polygons have sides of different lengths.

Here are some common polygons:

 

Pentagons have 5 sides:

A regular pentagon

A regular pentagon

 

An irregular pentagon

An irregular pentagon

 

 

Hexagons have 6 sides:

A regular hexagon

A regular hexagon

 

An irregular hexagon

 

An irregular hexagon

 

A regular heptagon

A regular heptagon

An irregular heptagon

An irregular heptagon

 

 

 

Octagons have 8 sides:

A regular Octagon

 

A regular octagon

 

An irregular Octagon

 

An irregular octagon

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