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# The Trapezium Rule - PowerPoint PPT Presentation

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

When we can’t integrate...

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 use trapeziums to make an estimate

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? use trapeziums to make an estimate

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 = use trapeziums to make an estimate

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 Area = use trapeziums to make an estimate

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 use trapeziums to make an estimate

= 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]

TRAPEZIUM RULE use trapeziums to make an estimate