# Trapezoidal Rule Formula

## Trapezoidal Rule Formula

The Trapezoidal Rule Formula, also referred to as the trapezoid rule or trapezium rule, is a numerical analysis method for approximating the definite integral. The trapezoidal rule is an integration rule that divides a curve into smaller trapezoids in order to calculate the area under a curve. The area under the curve is calculated by adding up the areas of all the small trapezoids. Students need to learn the Trapezoidal Rule Formula. They are also advised to focus on the derivation of the Trapezoidal Rule Formula. Students should practice all the questions specific to Trapezoidal Rule Formula. Numerical methods are tools that use algebraic and arithmetic operations to roughly solve systems of complex equations. There are some equations that are very challenging to solve analytically; however, if they are reformulated using arithmetic operations, students will be able to provide a rough solution. Numerical methods have many uses, including resolving integrals, derivatives, and even approximations. Students can scale up an implementation of the trapezoidal method or rule in integrals to provide a rough solution to a number of algorithms. It is an important topic in Mathematics that students need to focus on.

## What is Trapezoidal Rule?

The midpoint rule of the Newton-Cotes formulas, of which the Trapezoidal Rule Formula is a member, is a family of formulas for numerical integration that includes the trapezoidal rule. Another member of the same family, Simpson’s rule generally converges more quickly than the trapezoidal rule for functions that are twice continuously differentiable, though not always. However, the trapezoidal rule converges more quickly overall than Simpson’s rule for a variety of classes of rougher functions (those with weaker smoothness conditions).

Additionally, when periodic functions are integrated over their periods—which can be analysed in a variety of ways—the trapezoidal rule tends to become extremely accurate. Peak functions can have a similar effect. Clenshaw-Curtis quadrature can be thought of as a change of variables that allows arbitrary integrals to be expressed in terms of periodic integrals, at which point the trapezoidal rule can be accurately applied. Gaussian quadrature can be viewed as a change of variables to express arbitrary integrals in terms of periodic integrals.

## Trapezoidal Rule Formula

The numeric method for approximating the definite integral uses the trapezoidal rule. The curve is divided into small trapezoids in this integration rule. The total area of the curve can then be calculated by adding all the trapezoidal areas. The trapezium rule and the trapezoid are other names for it. The Newton Cotes formula, which states that we can determine the value of integral as the nth border polynomial, forms the basis of the trapezoidal rule. The area under the curve can be roughly calculated using Riemann’s sums. The area under the curve is divided into rectangles, and the sum of the areas of each of the individual rectangles represents the overall area. The definition of the integrals can also be reached using this approximation technique. The trapezoidal rule takes a similar tack. This Trapezoidal Rule Formula divides the area under the curve into numerous trapezoids, whose areas are then added and calculated to approximate the total area.

### Derivation of Trapezoidal Rule Formula

One of the most significant rules in the theory of integration is this one. Every area that needs to be calculated is split up into numerous components. This time, the area is divided into a trapezoidal shape, as the name suggests. The area bounded by a function f(x) and the x-axis is shown in the figure below. Calculating the distance between x = a and x = b is the objective.

It is seen that there is still some open space. This indicates that this rule is only a rough guide, but as the number of trapezoids rises, so does the gap between the actual area and the approximated area. The approximated area theoretically equals the actual area once the number of trapezoids reaches infinity.

### How to Apply Trapezoidal Rule?

When it is difficult to find a closed form of the integral or when an approximate value only of the definite integral is required, students can use numerical integration to estimate its values.

The midpoint rule, Trapezoidal Rule Formula, and Simpson’s rule are the methods for numerical integration that are most frequently used.

While the Trapezoidal Rule Formula uses trapezoidal approximations to approximate the definite integral, the midpoint rule uses rectangular regions to do so.

Simpson’s rule first approximates the original function using piecewise quadratic functions, then it approximates the definite integral.

Students are required to learn the application of the Trapezoidal Rule Formula. All the steps involved in the application of the Trapezoidal Rule Formula need to be focused on. Similar to the prior instance, Riemann summarises research on the concept of dividing the area under the curve into various rectangular parts. The area gets ever-closer to the current area as the number of rectangles rises. There is a function f in the figure below (x). This function’s domain is divided up into numerous rectangles. The sum of the areas of each rectangle makes up the total area beneath the curve. The area is actually calculated using the Trapezoidal Rule Formula integration formula by simulating the area under a function’s graph as a trapezoid. After that, the left and right sums are averaged. If the underlying function is smooth, the accurate value of the trapezoidal may not be as accurate as Simpson’s Rule. This is due to the fact that Simpson’s Rule uses quadratic approximation rather than linear approximation. Both Simpson’s Rule and the Trapezoidal Rule Formula provide an approximate value, but Simpson’s Rule produces a result that is even more precise.

Since the word “trapezoid” originally meant “a little table” in Ancient Greek, it also refers to a “irregular quadrilateral.” In 1570, Marinus Proclus introduced the word “trapezium” to the English language. In the first book of Euclid’s Elements, he was the one who first used the word “trapezoid.” Because small trapezoids rather than rectangles are used to divide the area under the curve when it is evaluated, this rule is known as the “trapezoid rule.” Another name for it is the trapezium rule. A technique for estimating definite integrals of functions is Simpson’s rule. It is exact for linear and quadratic functions and typically (but not always) more accurate than approximations made using Riemann sums or the trapezium rule. According to Simpson’s Rule, the error in estimating a four-times-differentiable function’s integral is proportional to the function’s fourth derivative at some point in the interval.

### Examples Using Trapezoidal Rule

Regular question practice helps students prepare better for examinations. It is crucial to be knowledgeable about the curriculum. The syllabus includes an outline of the topics and subtopics for the Mathematics examination. Every chapter’s questions must be regularly practised by students. Mathematics concepts are essential for students to develop their logical reasoning and analytical thinking skills. This makes it essential to practice Mathematics problems in schools. The NCERT Solutions will assist students in developing practice habits.

### Practice Questions on Trapezoidal Rule

It is crucial for students to practice questions on a regular basis. Students can improve their exam preparation by using sample papers and previous years’ Mathematics examinations. Examining previous years’ papers will help you understand the mathematics marking scheme. Students are expected to practise heavier topics more frequently. Solving old papers and practise exams can improve students’ level of preparation. They can download the most recent Mathematics curriculum from Extramarks. Students can create a strategy for effectively preparing for the mathematics exam with the help of the syllabus. It is important for students to understand the requirements of the questions in order to give proper solutions to them. Regular exercise helps students get used to the process of answering questions. It is recommended that students complete as many questions about Trapezoidal Rule Formula as they can. Students will gain a deeper understanding of the subjects by practising problems based on the Trapezoidal Rule Formula. The Trapezoidal Rule Formula is useful for fully grasping concepts.

### 1. What is the function of the Trapezoidal Rule Formula?

For approximating the definite integrals, the Trapezoidal Rule Formula is used. There is a constant need for revisions to the Trapezoidal Rule Formula. It is advised that students review each of the Trapezoidal Rule Formula questions.

### 2. What kinds of study materials can students use on Extramarks to prepare well for their final exams?

Students can download detailed answers to questions about the Trapezoidal Rule Formula from Extramarks. Practising questions regularly is made possible with assistance from the Extramarks website and mobile application. The NCERT solutions are used to solve problems as they arise.