NCERT Solutions for Class 9 Maths Exercise 13.3 Surface Areas and Volumes in Hindi and English Medium for session 2022-2023. Class 9 Maths Exercise 13.3 is related to surface area of cone or conical figures. Solutions are given here in PDF and Videos format to download and use offline.

## NCERT Solutions for Class 9 Maths Exercise 13.3

### Class 9 Maths Exercise 13.3 Explanation

The purpose of the Tiwari Academy’s NCERT solutions for Maths class 9 is to help the students. It extends their knowledge of the area, perimeter, and volume also include surface area and lateral surface area.

While doing the practice of the chapter you must know a few most important definitions that shall induce the knowledge of the few points that you missed in the concept. The useful definitions are given here to help the students.

#### Definitions and Terms related to Exercise 13.3

Axis – A line of reference about which a point, object, a line is drawn or measured. In a symmetrical shape. The Axis is usually a line of symmetry. Apothem is the line that connects the center of a regular polygon with one of its sides. The line is perpendicular to the side.

Radius – this is the definition that you must have studied in the previous classes and might have used to measure many times in questions. But formally, it is the distance from the geometric center of the curved shape to its circumference. In chapter 13 from NCERT solutions, you will study various other shapes mainly 3-dimensional figures such as a sphere, hemisphere, cylinder, and other similar figures.

##### Shapes and concepts are intertwined

For the triangular related shapes, you will study the pyramid, right circular cone. The similarities between the two figures are that they both are 3-dimensional triangular figures. However, they also contain properties of a square, circle, and triangle at the base.

That is why it is absolutely vital for the students to read the question carefully to note it down. Then construct the rough figure before calculating its area, volume, lateral surface. Here, we will calculate the areas that doesn’t have any fix formulae. You will be given some of the important properties through which you will be able to calculate the solutions.

###### Way to calculate Surface Areas in Exercise 13.3

Finding surface area of figures are one of the trickiest parts of the chapter 13. If you see the figures 15, and 16 illustrates how a triangular right angle cone contains qualities of the circle, triangle, and cylinder. If it is hollow inside, it could be round at the bottom, or the base could be square.

There are some of the direct formulae that you must remember to make calculation faster. In exercise 13.3 there are 8 questions. Most of them require to calculate the surface area in one way or the other.