## How do you find the outer radius?

The outer radius is the (positive) distance between this x position and x = 6, so R = 6 – y2. The volume of each washer is the volume of a disk of radius R that’s had a disk of radius r removed from its center.

### How do you find the inner and outer radius of a washing machine?

The outer function is our outer radius, and the inside function is our inner radius. The formula for the area of a circle is pi * r^2. 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.

#### What is inner radius and outer radius?

Solution: The outer radius of a circular path R = 728m2 = 364 m. The inner radius of a circular path r = 700m2 = 350 m. Therefore, breadth of the circular path = R – r = 364 m – 350 m = 14 m. Area of the circular path = π(R + r)(R – r)

**What is outer radius?**

The outer radius of an annulus is the radius of the larger of the 2 concentric circles that form its boundary. In the above diagram, the outer radius is denoted R.

**What is an inner radius?**

The inner radius of a ring, tube or other hollow object is the radius of its cavity. For regular polygons, the radius is the same as its circumradius. The inradius of a regular polygon is also called apothem.

## How do I find the radius of my washing machine?

An infinitesimally thin piece made by slicing the solid vertically is a washer with outer radius R = f(x), inner radius r = g(x) and thickness dx.

### What is the outer radius in washer method?

In both cases, the outer radius is the distance from the axis of rotation to the outer curve and the inner radius is the distance from the axis of rotation to the inner curve.

#### What is 2 pi r DR?

Indeed, a disk may be divided into a number of thin concentric annuli; an annulus of radius r and width dr has area approximately 2 pi r dr; and adding these areas by integrating gives the area of the disk. Thus pi r2 is the integral of 2 pi r, or, equivalently, 2 pi r is the derivative of pi r2.

**How do you find the inner diameter of a circle?**

If you don’t have the radius, divide the circumference of the circle by π to get the diameter. If you don’t have the radius or the circumference, divide the area of the circle by π and then find that number’s square root to get the radius. Then, you can just multiply the radius by 2 to find the circle’s diameter.