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# RD Sharma Class 8 Solutions Chapter 20 - Area of Trapezium and Polygon (Ex 20.2) Exercise 20.2

Last updated date: 12th Sep 2024
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## RD Sharma Class 8 Solutions Chapter 20 - Area of Trapezium and Polygon (Ex 20.2) Exercise 20.2 - Free PDF

Free PDF download of RD Sharma Class 8 Solutions Chapter 20 – Area of Trapezium and Polygon Exercise 20.2 solved by expert Mathematics teachers is available on Vedantu. All Chapter 20 – Area of Trapezium and Polygon Ex 20.2 Questions with Solutions for RD Sharma Class 8 Maths will help you to revise the complete syllabus and score more marks. Register for online coaching for IIT JEE (Mains & Advanced) and other engineering entrance exams. 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.

RD Sharma class 8 solutions chapter 20 is a compilation of the area of trapezium and polygon with detailed explanations in Maths problems. It covers all topics in detail, including how to calculate the area of a triangle given its height.

The area of a trapezium is the sum of two bases times the height. The area of a polygon is found by multiplying its perimeter with the width or length that you choose (usually use whichever one is longer).

## Important Discussions in the Chapter

In this chapter, we learn about the area of a trapezium and polygon. In Section 20.16, you can find out how to calculate the area of a triangle given its height. The concept is very important from an exam point of view so make sure that you understand it well! You need to be able to work with trapezium and polygons to be able to do well in your exams.

In this chapter, we also learn about the area of a trapezium and polygon, including how to find out an unknown length or width given some other line segment with the same endpoints as yours (and vice versa). Make sure you keep all these formulas on hand while answering questions! You can use them for any shape, so they are very important. The units that were used in the question will help you determine what type of calculation is needed: if it’s centimetres, then one side would need to be multiplied by 100; however if it was kilometres, you would need to multiply our answer by 1000 instead. If there was some other line segment with the same endpoints as your given one, it would create two triangles sharing those vertices along with their respective sides. Finally, remember that the area of a trapezium or polygon must lie within the range –10000<=Area<= 10000.

### The Concept of the Area of a Trapezium and Polygon

It is very important from an exam point of view. So, make sure you understand it well.

The first concept of the area of a trapezium and polygon is the area of a trapezium that is the sum of two bases times the height.

The second concept to remember is that for a polygon, you can choose to use either the width or length as your base and then multiply it by the number of sides.

The third concept to remember is that the area of a trapezium and the area of a polygon are both positive.

The fourth concept to keep in mind is that you can use this formula for all polygons, no matter how many sides they have.

The fifth important thing to know about a trapezium or a polygon is that if one side has been doubled, then its corresponding diagonal must be used twice (this also applies for finding the perimeter).

The sixth thing you need to remember when trying to find out an unknown length or width of either shape is that if there was some other line segment with the same endpoints as your given one, it would create two triangles sharing those vertices along with their respective sides.

The seventh concept to remember is that if you are trying to find out the area of a trapezium or polygon, then make sure your answer lies within the range –10000 <= Area <= 10000.

The eighth thing about finding an area for either shape is to check what units they used in their question (for example, both sides could be centimetres). The ninth and final main idea when it comes to learning how to work with trapeziums and polygons is that don’t forget all the formulas; regular shapes like this can often appear on exams!

So, these are the eight main points that you need to remember when it comes to working with trapeziums and polygons. Make sure you go over them a few times so that the concepts sink in. Once you have mastered these, finding an area for any shape will be a breeze!

## FAQs on RD Sharma Class 8 Solutions Chapter 20 - Area of Trapezium and Polygon (Ex 20.2) Exercise 20.2

1. How to study the area of trapezium and polygon easily?

One easy way to study the area of trapezium and polygon more easily is by doing lots of questions, this will help you learn the topics well.

2. What is the formula for finding an area of a trapezium?

To find out the area of a trapezium, you will need to add two bases and multiply it with height (or if there was some other line segment with the same endpoints as your given one, then we can create two triangles sharing those vertices along with their respective sides).

3. What do I study if I don’t know what units they used in their question?

If you are unable to understand which unit was used, then try and work on this concept that both sides could be centimetres or kilometres, etc. Just by understanding these concepts, you will get answers within a specific range (–10000 <= Area <= 10000) but make sure not to put anything in the form of a number.

4. How much time does visualising shapes take to complete?

Visualising shapes usually takes around 15 minutes to complete although it may vary depending on your prior knowledge of the topic.

5. What if I am not able to understand something in the area of trapezium and polygon?

If you still cannot understand anything in the area of trapezium and polygon, then we recommend that you leave us a comment with your problem/doubts and we will get back to you at the earliest.