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The Trapezium Rule. When we can’t integrate. Find the shaded area . We don’t know how to integrate this function, so we can use trapeziums to make an estimate. So can divide this area up into 4 trapeziums of equal width. Area of a Trapezium. Area = ½ (a + b) h.

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the trapezium rule

The Trapezium Rule

When we can’t integrate...

we don t know how to integrate this function so we can use trapeziums to make an estimate
We don’t know how to integrate this function, so we can use trapeziums to make an estimate

So can divide this area up into 4 trapeziums of equal width

area of a trapezium
Area of a Trapezium

Area = ½ (a + b) h

a and b are the parallel sides

h is the width

how do we find the height of each side of the trapeziums
How do we find the height of each side of the trapeziums?

The height of each trapezium can be found by substituting the x value into the function to get y

y2

y3

y4

y1

y0

total area
Total Area =

y2

y0

y1

y3

y4

h

h

h

h

½ (y0 + y1)h

+ ½ (y1 + y2)h

+ ½ (y2 + y3)h

+ ½ (y3 + y4)h

total area7
Total Area =

½ (y0 + y1)h

= ½ h [(y0 + y1) + (y1 + y2) + (y2 + y3) + (y3 + y4)]

= ½ h [y0 + y1 + y1 + y2 + y2 + y3 + y3 + y4]

= ½ h [y0 + 2(y1 + y2 + y3 ) + y4]

+ ½ (y1 + y2)h

+ ½ (y2 + y3)h

+ ½ (y3 + y4)h

trapezium rule
TRAPEZIUM RULE

= ½ h [y0 + 2(y1 + y2 + y3 ) + y4]

In general, for any area divided up into n trapezia of equal width

= ½ h [y0 + 2(y1 + y2 + ... + yn-1 ) + yn]

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