Consider that R is the radius of the outer disk and r as the radius of the inner disk. Consider a washer as a "disk with a hole in it" or as a disk with a disk eliminated from the center. We use a washer method when the axis of the revolution is not a boundary of the plane region and cross-sections are perpendicular to the axis of revolution. ![]() In case, the disk is perpendicular to the y-axis, the radius should be defined as a function of y. When a disk is perpendicular to the x-axis, then the radius should be defined as a function of x. The volume of each disk is equal to the product of the area and its thickness. This is due to the fact that the cross section of a disk is a circle having the area. We can use the disk method to calculate the volume of a solid when the axis of revolution is the boundary of the plane region and cross-sections are perpendicular to this axis of revolution. We have discussed each approach along with the examples below. Each of these elements needs a unique approach in setting up a definite integral to find the volume. This kind of solid will be composed of three types of elements: disks, washers, or cylindrical shells. This volume is obtained through a revolution of a plane region about the vertical or horizontal line that does not cross through the plane. We can also utilize the definite integral to determine the volume of a solid. In the next section, we will discuss how to determine the volume of a function using the integration technique. In calculus, the differentiation and integration of a given function are linked using a theorem known as the Fundamental Theorem of Calculus. Integral calculus further contains definite and indefinite integral. These two types of problems are the crux of integral calculus. Finding the area bounded by the graph of a function under certain conditions known as constraints.Determining the problem function when the derivatives are given.It helps us to solve the following two types of problems: The concept of integration is included in the integral calculus and it is the reverse process of differentiation. Limits enable us to study the result of points on the graph as to how much they get near to one another until the distance almost becomes zero.Ĭalculus is divided into two main categories: Generally, in calculus, we use limits or boundaries where we are dealing with algebra and geometry. These functions have a collection of small data, hence they cannot be measured separately. The integral is computed to find the functions which denote area, volume, or displacement. The integration of a function represents the summation of discrete data. ![]() ![]() But before proceeding to discuss the volume of a function by integration method, first, let us recall the integration concept. In this article, you will learn how to calculate the volume of a function using integration.
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