**Washer Method Inner and Outer Radius Thanks a lot!!!D**

The inner radius in this case is the distance from the \(y\)-axis to the inner curve while the outer radius is the distance from the \(y\)-axis to the outer curve. Both of these are then \(x\) distances and so are given by the equations of the curves as shown above.... The region is revolved about the y-axis to generate a solid of revolution. The object of the problem is to first approximate, then compute (using limits of Riemann sums) the volume of the solid of revolution.

**Math 2260 Exam #1 Practice Problem Solutions**

The outer radius is what part of the region is farther away from the line of rotation. Note in the washer method, because we are squaring both the inner and outer radius it doesn't ma...... 26/03/2012Â Â· The 'outer' radius is the radius of the washer from the centre to the outside edge (a circle with a diameter of 20mm) and the cut-out is a circle of diameter 14mm. (I think you were assuming a hole of diameter 14mm and then a torus around it which is 10mm from the inner edge to the outer edge).

**Washer method rotating around horizontal line (not x-axis**

The inner radius in this case is the distance from the \(y\)-axis to the inner curve while the outer radius is the distance from the \(y\)-axis to the outer curve. Both of these are then \(x\) distances and so are given by the equations of the curves as shown above.... 9/02/2011Â Â· I am in Calc II and a few days ago we did the section on the disk/washer method. I get how to use the volume formula and integrate just fine, what I don't quite understand is how to obtain the inner and outer radius?

**Washer Method in Calculus Formula & Examples Video**

MATH 125 EXAM I REVIEW Exam 1 will cover 4.10, 5.1 - 5.5, and 6.1 - 6.3. This review sheet discuss, in a very basic way, the key concepts from these sections.... 9/02/2011Â Â· I am in Calc II and a few days ago we did the section on the disk/washer method. I get how to use the volume formula and integrate just fine, what I don't quite understand is how to obtain the inner and outer radius?

## How To Choose Outer And Inner Radius Washer Method

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## How To Choose Outer And Inner Radius Washer Method

### The washer method can be applied in a number of situations â€” remember for the washer method should be quite general. The key points are the following: Use the washer method when splitting the region into rectangles that are perpendicular to the line of rotation. Remember the formula as Volume (outer radius)2 (inner The outer radius and inner radius are found in different ways depending on

- So the area of the washer is pi * R^2 - pi * r^2, where the R is the outer radius and r is the inner radius. Plugging the functions into our respective radii will give us a formula for the washer
- The outer radius is $2-(-1)=3$ of the washer; $\pi\cdot 3^2=9\pi$ is the area of the disk with that radius. Similarly, $1-(-1)=2$ is the inner radius of the washer, so $\pi\cdot2^2=4\pi$ is the area of the hole in the washer.
- The outer radius is what part of the region is farther away from the line of rotation. Note in the washer method, because we are squaring both the inner and outer radius it doesn't ma...
- Pay special attention to what curve makes up the outer radius of the shape, and what curve makes up the inner radius. If rotating the region around a horizontal axis, the cross section will be a vertical circle.

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