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Published byFerdinand Gardner Modified over 8 years ago

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**A Quadrilateral is a four sided shape which can be made from 2 triangles**

The angles add up to 2 X 180 = 360º D B A + B + C + D =360 The area =sum of the areas of the two triangles C It fits inside a circle

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**The following quadrilaterals have properties which make them special**

square rectangle rhombus kite Trapezium without symmetry Isosceles Trapezium with symmetry parallelogram

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THE SQUARE 4 equal sides = 90 Opposite sides equal and parallel Angles are = 90º Diagonals are equal Diagonals bisect each other at 90 º 4 lines of symmetry and quarter turn symmetry Fits outline 8 ways

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**The rectangle = Opposite sides equal and parallel Angles are = 90º**

Diagonals are equal Diagonals bisect each other 2 lines of symmetry and half turn symmetry Fits outline 4ways

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** The rhombus Y 4 equal sides Opposite sides equal and parallel**

X Y 4 equal sides Opposite sides equal and parallel Opposite angles are equal Diagonals bisect each other at 90 º Diagonals bisect the angles 2 lines of symmetry and HALF turn symmetry Fits outline 4 ways

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**The parallelogram = Opposite sides equal and parallel X**

Y Opposite sides equal and parallel Opposite angles are equal Diagonals bisect each other half turn symmetry Fits outline 2 ways

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**The Kite = = 2 pairs of adjacent equal sides**

One pair of opposite angles are equal X One diagonal bisects the other one at 90 º One diagonal bisecst the angles 1 line of symmetry Fits outline 2 way

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**The isosceles trapezium**

One pair of parallel sides 1 pairs of equal opposite sides X two pairs of adjacent angles are equal diagonals are equal Y 1 line of symmetry Fits outline 2 way

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The trapezium One pair of parallel sides

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