Post on 05-Jan-2016
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Quadrilateral
A shape with four sides.
Key Features
Lines of Symmetry?
Rotational Symmetry?
It depends on what sort of quadrilateral it is.
It depends on what sort of quadrilateral it is.
Names of Special Quadrilaterals
Rectangle, Square, Parallelogram, Trapezium, Rhombus, Kite.
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Rectangle
A quadrilateral with four right-angles.Opposite sides are the same length.
Key Features
Lines of Symmetry?
Rotational Symmetry?
Two, unless the rectangle is a square.
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
A quadrilateral with four equal sides and four right-angles.
Key Features
Lines of Symmetry?
Rotational Symmetry?
Four.
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
A quadrilateral with opposite sides that are parallel and the same length.
Key Features
Lines of Symmetry?
Rotational Symmetry?
Only if it’s a rectangle, a square or a rhombus.
Order 2.
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Oblong
A rectangle which is not a square.
Key Features
Lines of Symmetry?
Rotational Symmetry?
Two.
Order 2.
Is an Oblong a Parallelogram?
Yes, because both pairs of opposite sides are parallel.
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Trapezium
A quadrilateral with just one pair of parallel sides.
Key Features
Lines of Symmetry?
Rotational Symmetry?
Only if it’s an isosceles trapezium.
None.
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Rhombus
A quadrilateral with four equal sides.
Key Features
Lines of Symmetry?
Rotational Symmetry?
Two.
Order 2.
Is a Rhombus a Parallelogram?
Yes, because both pairs of opposite sides are parallel.
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Kite
A quadrilateral with two pairs of adjacent sides that are equal.
Key Features
Lines of Symmetry?
Rotational Symmetry?
One.
None.