Explore quadrilaterals in KS3 maths. Identify squares, rectangles, parallelograms, kites, and trapeziums; compare sides, angles, diagonals, and symmetry to classify shapes and solve perimeter and area problems.
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You can find more about this topic by visiting BBC Bitesize - Shapes
A circle does not have four sides
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All four sides MUST be equal too
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The definition of a trapezium is a quadrilateral with at least one pair of parallel sides
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A kite is a quadrilateral whose four sides can be grouped into two pairs. Each pair is adjacent and of equal-length
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A triangle does not have four sides
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By adding a diagonal you can split a quadrilateral into 2 triangles. The sum of the angles in a triangle is 180o, so the sum of two triangles will be 360o
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Just as a scalene triangle has sides of unequal length, the same is true of a scalene quadrilateral
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If it did have a line of symmetry then it would be either a rhombus or a rectangle
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Just as an isosceles triangle has two sides of equal length, so too with an isosceles trapezium which makes it symmetrical
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A rhombus is like a 'squashed' square or a diamond
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