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**Properties of 2-D Shapes**

Equilateral Triangle Isosceles Triangle Right-Angled Triangle Scalene Triangle Quadrilateral Rectangle Square Oblong Parallelogram Trapezium Rhombus Kite Regular Pentagon Regular Hexagon Regular Octagon Regular Decagon Circle

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**Equilateral Triangle Key Features**

All three sides are the same length and all three angles are equal. Lines of Symmetry? Three. Rotational Symmetry? Order 3.

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**Isosceles Triangle Key Features**

A triangle with two equal sides and two equal angles. Lines of Symmetry? One. Rotational Symmetry? None.

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**Scalene Triangle Key Features**

A triangle with three different sides and three different angles. Lines of Symmetry? None. Rotational Symmetry? None.

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**Right-Angled Triangle**

Key Features A triangle with one right-angle. Can a Triangle be Right-Angled and Isosceles? Yes. Lines of Symmetry? Only if it’s an isosceles triangle - one line. Rotational Symmetry? None.

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**Quadrilateral Key Features A shape with four sides. Lines of Symmetry?**

It depends on what sort of quadrilateral it is. Rotational Symmetry? It depends on what sort of quadrilateral it is. Names of Special Quadrilaterals Rectangle, Square, Parallelogram, Trapezium, Rhombus, Kite.

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**Rectangle Key Features**

A quadrilateral with four right-angles. Opposite sides are the same length. Lines of Symmetry? Two, unless the rectangle is a square. Rotational Symmetry? Order 2, unless the rectangle is a square. Is a Rectangle a Parallelogram? Yes, because both pairs of opposite sides are parallel.

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Square Key Features A quadrilateral with four equal sides and four right-angles. Lines of Symmetry? Four. Rotational Symmetry? Order 4. Is a Square a Rectangle? Yes, because it’s a quadrilateral with four right-angles. Is a Square a Parallelogram? Yes, because both pairs of opposite sides are parallel. Is a Square a Rhombus? Yes, because it’s got four sides all the same length.

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**Parallelogram Key Features**

A quadrilateral with opposite sides that are parallel and the same length. Lines of Symmetry? Only if it’s a rectangle, a square or a rhombus. Rotational Symmetry? Order 2.

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**Oblong Key Features A rectangle which is not a square.**

Lines of Symmetry? Two. Rotational Symmetry? Order 2. Is an Oblong a Parallelogram? Yes, because both pairs of opposite sides are parallel.

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**Trapezium Key Features**

A quadrilateral with just one pair of parallel sides. Lines of Symmetry? Only if it’s an isosceles trapezium. Rotational Symmetry? None.

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**Rhombus Key Features A quadrilateral with four equal sides.**

Lines of Symmetry? Two. Rotational Symmetry? Order 2. Is a Rhombus a Parallelogram? Yes, because both pairs of opposite sides are parallel.

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Kite Key Features A quadrilateral with two pairs of adjacent sides that are equal. Lines of Symmetry? One. Rotational Symmetry? None.

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**Regular Pentagon Key Features**

A shape with five equal sides and five equal angles. Lines of Symmetry? Five. Rotational Symmetry? Order 5.

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**Regular Hexagon Key Features**

A shape with six equal sides and six equal angles. Lines of Symmetry? Six. Rotational Symmetry? Order 6.

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**Regular Octagon Key Features**

A shape with eight equal sides and eight equal angles. Lines of Symmetry? Eight. Rotational Symmetry? Order 8.

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**Regular Decagon Key Features**

A shape with ten equal sides and ten equal angles. Lines of Symmetry? Ten. Rotational Symmetry? Order 10.

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Circle Key Features Every point on the circumference is the same distance from the centre. Lines of Symmetry? Infinite. Rotational Symmetry? Order infinity.

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END OF PRESENTATION

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The angles add up to 2 X 180 = 360º D B A + B + C + D =360

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