# Riemann Sums - PowerPoint PPT Presentation

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Riemann Sums. Width of partition:. Adds the rectangles, where n is the number of partitions (rectangles). Height of rectangle for each of the x-values in the interval. What is a Riemann Sum?. Takes approximating the area under a curve with rectangles to the next level LOOKS LIKE:.

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Riemann Sums

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## Riemann Sums

Width of partition:

Adds the rectangles, where n is the number of partitions (rectangles)

Height of rectangle for each of the x-values in the interval

### What is a Riemann Sum?

• Takes approximating the area under a curve with rectangles to the next level

LOOKS LIKE:

### What Do We Do With This?

If the number of partitions is allowed to approach infinity…what happens?

That’s right! The rectangular approximation approaches the EXACT area under the curve! How do we do it?

### What in the World?

The integral, from a to b, of f(x) with respect to x

### What’s With This Thing?

Integrand (between the integral sign and the dx)

Upper (right) limit of integration

Integral sign (originated from the summation sign, Sigma)

Lower (left) limit of integration

Tells you the variable of integration (who is the variable)

### Examples of How to Read

• The integral, from 1 to 4, of x2 with respect to x is 21

### Writing Riemann Sums as Integrals

Where x is between 0 and 2.

### Writing Riemann Sums as Integrals

Where x is between 3 and 7.

### Writing Riemann Sums as Integrals

Where x is between -2 and 2.

## Definite Integrals

Why is it called a definite integral?

Because the integral sign includes limits of integration!

### Properties of Definite Integrals

Why?

• Because the integral is asking for the area under the curve between 2 and 2…there is no area covered!

### Properties of Definite Integrals

Why is this okay?

• Because an integral is just a limit of a Riemann Sum…so all the properties of limits hold for integrals!