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AP Calculus

Area

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Calculus was built around two problems

Tangent line

Area

Slide 3

To approximate area, we use rectangles

More rectangles means more accuracy

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Area

Can over approximate with an upper sum

Or under approximate with a lower sum

Slide 5

Area

Variables include

Number of rectangles used

Endpoints used

Slide 6

Area

Regardless of the number of rectangles or types of inputs used, the method is basically the same.

Multiply width times height and add.

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An upper sum is defined as the area of circumscribed rectangles

A lower sum is defined as the area of inscribed rectangles

The actual area under a curve is always between these two sums or equal to one or both of them.

Slide 8

We wish to approximate the area under a curve f from a to b.

We begin by subdividing the interval [a, b] into n subintervals.

Each subinterval is of width .

Slide 9

Area Approximation

Slide 10

Area Approximation

We wish to approximate the area under a curve f from a to b.

We begin by subdividing the interval [a, b] into n

subintervals of width .

Minimum value of f in the ith subinterval

Maximum value of f in the ith subinterval

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Area Approximation

Slide 12

Area Approximation

So the width of each rectangle is

Slide 13

Slide 14

So the width of each rectangle is

The height of each rectangle is either

or

Area Approximation

Slide 15

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