# NCERT Solutions for Class 9 Maths Chapter 8 Exercise 8.1

CBSE NCERT Solutions for Class 9 Maths Chapter 8 Exercise 8.1 Quadrilaterals in Hindi and English Medium. Get here all the question answers with suitable solutions for ex. 8.1 of grade 9 mathematics updated for new academic session 2020-2021.

UP Board students can also use these solutions as UP Board Solutions for their help as there are applicable in Uttar Pradesh Board. Solutions and available in Hindi Medium as well as English Medium videos format with PDF file format free to use online or download to use offline.

## Class 9 Maths Chapter 8 Exercise 8.1 Solution in Hindi and english

 Class: 9 Mathematics Chapter: 8 Quadrilaterals Exercise: 8.1 NCERT Solutions in PDF and Videos

### Class 9 Maths Exercise 8.1 Solutions in Hindi Medium Video

#### Class 9 Maths Exercise 8.1 Question 1, 2, 3 and 4 Solutions

Class 9 Maths Exercise 8.1 Question 1 and 2
Class 9 Maths Exercise 8.1 Question 3 and 4

#### Class 9 Maths Exercise 8.1 Question 5, 6 and 7 Solutions

Class 9 Maths Exercise 8.1 Question 5 and 6
Class 9 Maths Exercise 8.1 Question 7

#### Class 9 Maths Exercise 8.1 Question 8 and 9 Solutions

Class 9 Maths Exercise 8.1 Question 8
Class 9 Maths Exercise 8.1 Question 9

#### Class 9 Maths Exercise 8.1 Question 10, 11 and 12 Solutions

Class 9 Maths Exercise 8.1 Question 10 and 11
Class 9 Maths Exercise 8.1 Question 12

#### What to Study in Class 9 Maths Chapter 8

We have studied many properties of a triangle so far in the mathematics chapters of classes 9 and 6, and we know that by adding three non-collinear points in pairs, the figure thus obtained is a triangle. We mark the four points and see what we get by matching them in couples in order. Note that if all the ends meet together (on the same line), we get only one segment; if three of the four points match, we get a triangle, and if four of them If three points do not meet each other, then we get a closed figure with four. Sides. Thus a shape formed by the union of four points in a sequence is called a quadrilateral. In Mathematics Class 9, Chapter 8, we will consider only different types of quadrilaterals.

A quadrilateral has four sides, four angles, and four corners. In quadrilateral ABCD, AB, BC, CD, and DA are four arms; A, B, C, and D are four corners, and A, B, C, and D are four angles. Now join the opposite corner with C and B with D and AC. AC and BD are two diagonals of the quadrilateral ABCD. In Chapter 8 of the Ninth Mathematics, we will study more about the different quadrilaterals, properties, and parallelograms. We may wonder why we should explore quadrilaterals (or parallel quadrilaterals). If we look around us, we will find many objects with the shape of a quadrilateral: floors, walls, ceilings, your classroom windows, blackboards, each face of the duster, each page of your book, part of our study: table, and many other things.

Sometimes, the objects we look around, maybe in the shape of a rectangle. Chapter 8 of Class 9 Maths will study more about the quadrilateral, especially the parallelogram. A rectangle is also a parallel quadrilateral, and all the properties of a rectangle are valid for a rectangle. Let us now recall the property of the sum of the angles of a quadrilateral. The sum of the angles of a quadrilateral is 360. The fact can be verified by drawing a diagonal and dividing the quadrilateral into two triangles.

##### Should we do examples given just before the exercise 8.1 of 9th Maths?

Examples given just before the exercises are always important for exams and useful for clearing doubts. Always do all examples before going through the exercises.

##### Which is the most important example from exercise 8.1 of class 9 Maths?

There is a total of six examples given just before exercise 8.1 of CBSE Class 9 Maths. Example numbers 4, 5, and 6 are considered as necessary for school tests or terminal exams.

##### Which questions from exercise 8.1 of CBSE grade 9 are vital for the exam?

There is a total of 12 questions given in exercise 8.1 of 9th Maths. Out of which, questions 9 and 12 are frequently asked in exams.

###### Some essential facts about a square, a rectangle, and a rhombus are all parallelograms.
1. A square is a rectangle and also a rhombus.
2. A parallelogram is a trapezium.
3. A kite is not a parallel quadrilateral.
4. A trapezium is not a parallel quadrilateral (since only one pair of opposite sides is in parallel, and we need both pairs to be parallel in a parallel quadrilateral).
5. A rectangle or a mausoleum is not a square.            