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RD Sharma Class 8 Solutions Chapter 20 - Area of Trapezium and Polygon (Ex 20.3) Exercise 20.3

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Last updated date: 21st May 2024
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RD Sharma Class 8 Solutions Chapter 20 - Area of Trapezium and Polygon (Ex 20.3) Exercise 20.3 - Free PDF

Free PDF download of RD Sharma Class 8 Solutions Chapter 20 - Area of Trapezium and Polygon Exercise 20.3 solved by Expert Mathematics Teachers of Vedantu. All Chapter 20 - Area of Trapezium and Polygon Ex 20.3 Questions with Solutions for RD Sharma Class 8 Maths will help you to revise the complete Syllabus and to score more marks. You can also register Online for Class 8 Science tuition on Vedantu to score more marks in the CBSE board examination. Students can also download NCERT Solution PDF for all subjects to prepare for their forthcoming exams.

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RD Sharma Class 8 Areas of Trapezium and Polygons - Basic Concepts

On this page let us discuss some problems related to trapezium and polygon. These problems are picked from RD Sharma and our experts have carefully designed solutions for the students to understand them easily. Students are recommended to try solving them first and cross-check their answers with the solutions provided. Solving as many problems as possible will improve the efficiency and conceptual understanding of the students. Following is an overview of the chapter:


A trapezoid (also known as a trapezium) is a flat 2D shape, with four straight sides. It has one pair of parallel sides which are usually the top and bottom sides. The parallel sides are called the bases, while the non-parallel sides are called the legs.

  • Area of a trapezium is the space covered by a trapezium when it is placed on a two dimensional field. It depends upon the length of the parallel sides and the height of the other two sides in the trapezium. Generally, are of a trapezium is measured in square units. 

The area of a trapezium is computed with the following formula: Area = \[\frac{1}{2}\] × Sum of parallel sides × Distance between them.

  • Area of a polygon: A polygon is a geometrical figure with more than three sides. It is divided into types based on the lengths of the sides, corresponding angles, etc, some examples of a polygon are square, trapezium, etc, If the polygon is regular it is easy to find out the area through definite formula but if the polygon is irregular, it is a bit difficult to find out the area of it.


The formula to calculate the area of a regular polygon is,

Area = \[\frac{(\text{number  of  sides} × \text{length  of  one  side} × apothem)}{2}\] 

where the value of apothem can be calculated using the formula, Apothem = \[\frac{(\text{length of one side})}{{2(tan \lgroup\frac{180}{\text{number of sides}})\rgroup}}\]


Find the latest study material, solutions, and practice papers at Vedantu and make your study time more efficient and fruitful. Get the best support from the top mentors during online Classes and learn the concepts in a better way. 

FAQs on RD Sharma Class 8 Solutions Chapter 20 - Area of Trapezium and Polygon (Ex 20.3) Exercise 20.3

1. What are the areas of a trapezium and a polygon?

Area of a trapezium is the place occupied by the trapezium in a two-dimensional plane. It is a 2D object in geometry. A trapezium is a quadrilateral that has four line segments. Area of Trapezoid = \[\frac{1}{2} [(a+b)h] \]square units. Both a and b are the sides of a trapezium and h is the perpendicular height of a trapezium. A polygon is a figure with more than two sides. It does not have any curves. Regular polygons have equal sides and angles. Irregular polygons have unequal lengths of sides and measuring angles. 

2. How does studying RD Sharma and solving the answers help me?

RD Sharma is a standard book recommended by experts and toppers to the students. It has several exercises according to the syllabus designed by the CBSE. students can either buy the book or download free exercises available online. The experts of Vedantu have designed the answers to these solutions. Practising this standard book will assess students about the nature of the questions, important topics, and weightage for each chapter. 


Practising all the problems will improve students’ efficiency and also help them save time while solving such problems in the exam. Questions from RD Sharma have been asked many times directly in the exam. So, to know the pattern and have an edge over other students, one needs to practice them. 

3. How many questions are there in Chapter 20 Class 8 RD Sharma?

Chapter 20 Class 8 from RD Sharma deals with the mensuration part. It has concepts about trapezium, polygons. It has many practice questions regarding the area of a trapezium and polygon. It mentions different types of polygons like regular and irregular polygons. This chapter has three exercises for the students to practice. The first exercise has 22 problems. The second exercise has 20 problems and the last exercise has 5 problems. Students are recommended not to leave any of these. 

4. How to download RD Sharma solutions for Class 8?

RD Sharma solutions for Class 8 CBSE students are recommended by many experts and toppers. You can download them online. Vedantu provides free PDF material for RD Sharma solutions for all the Classes, chapter-wise. You can download the free PDF material from the links given on this page and read it offline. You can also access it from various devices online. If the student can not afford to buy it or go outside, reading them online is the best solution. 

5. What are the topics and subtopics of chapter 20 Class 8?

Chapter 20 of the Class 8 CBSE textbook discusses trapeziums, trapezoids, different polygons, and how to measure their area. It discusses what regular and irregular polygons are. Regular polygons are easy and simple figures with similar lengths and angles whereas irregular polygons do not have equal sides and angles. So finding out the measurements of an irregular polygon is difficult compared to regular polygons. Practising as many problems as possible will help students solve the same problems with ease in the exams. For syllabus, previous year questions, and reference materials keep visiting Vedantu.