# NCERT Solutions for Class 8 Maths Chapter 11 Free PDF Download

## NCERT Solutions for Class 8 Maths Chapter 11 – Mensuration

NCERT solutions are a very important resource for students of CBSE Class 8. We provide a complete set ofÂ Â NCERT solutions for class 8 maths with an advanced level of difficulty which gives you sufficient opportunity to understand the concepts. In NCERT solutions for class 8 maths chapter 11, you will get a fair idea on the chapter and the sort of questions that are possibly asked in the exam and the method to answer them.

NCERT solutions for class 8 maths chapter 11 which will help you to effectively prepare for your examination and are prepared by subject experts. In NCERT solutions for class 8 maths chapter 11Â  the concepts are explained in details and all the doubts are instantly resolved by our subject matter experts during live doubt solving sessions and score good marks.

### CBSE Class 8 Maths Chapter 11 –Â Mensuration NCERT Solutions

In NCERT solutions for class 8 maths chapter 11, you will study perimeter and area of other plain closed figures, area of a trapezium, quadrilateral and special quadrilaterals, Polygon, Solid Shapes, Surface Area of Cube, Cuboid and Cylinder, Volume of Cube, Cuboid and Cylinder, the concept of volume and capacity.

### Sub-topics covered NCERT Solutions for Class 8 Maths Chapter 11 Mensuration

• Ex. 11.1 – Introduction
• Ex. 11.2 – Let us Recall
• Ex. 11.3 – Area of Trapezium
• Ex. 11.4 – Area of a Quadrilateral
• Ex. 11.4.1 – Area of special quadrilaterals
• Ex. 11.5 – Area of a Polygon
• Ex. 11.6 – Solid Shapes
• Ex. 11.7 – Surface Area of Cuboid, Cube, and Cylinder
• Ex. 11.7.1 – Cuboid
• Ex. 11.7.2 – Cube
• Ex. 11.7.3 – Cylinders
• Ex. 11.8 – Volume of Cuboid, Cube, and Cylinder
• Ex. 11.8.1 – Cuboid
• Ex. 11.8.2 – Cube
• Ex. 11.8.3 â€“ Cylinder
• Ex. 11.9 – Volume and Capacity

### NCERT Solutions for Class 8 Maths Chapter 11

This chapter will help you to learn about the different shapes like cube, cuboid, etc and their areas and volumes, different quadrilaterals and polygons and their areas. Let us now discuss the sub-topics of this chapter.

### Sub-topics covered under Class 8 Maths Chapter 11 – Mensuration

Ex. 11.1 – IntroductionÂ

In this, you will get to know about the different shapes in 2D and 3D.

Ex. 11.2 – Let us Recall

In this, you will study the areas of different 2D shapes like square, rectangle, and their combinations and comparisons.

Ex. 11.3 – Area of Trapezium

In this, you will study the area of trapezium and calculation of its area by the mathematical formula.

Ex. 11.4 – Area of aÂ  Quadrilateral

In this, you will study different types of quadrilaterals and method to find their area and perimeter by using their formulas.

Ex. 11.4.1 – Area of special quadrilaterals

In this, you will study about the special type of quadrilaterals such as rhombus, parallelograms, etc. and calculate their area by the formula.

Ex. 11.5 – Area of a Polygon

In this, you will study about finding the area of polygons by dividing it into different shapes.

Ex. 11.6 – Solid Shapes

In this, you will study about solid shapes like cube, cuboid and cylinder, their properties.

Ex. 11.7 – Surface Area of Cuboid, Cube, and Cylinder

In this, you will study about finding areas of solid shapes.

Ex. 11.7.1 – Cuboid

In this, you will study about finding the area of cuboid by the formula.

Ex. 11.7.2 – Cube

In this, you will study about finding the area of a cube by a formula.

Ex. 11.7.3 – Cylinders

In this, you will study about finding the area of a cylinder by a formula.

Ex. 11.8 – Volume of Cuboid, Cube, and Cylinder

In this, you will study about finding the volume of solid shapes.

Ex. 11.8.1 – Cuboid

In this, you will find the volume of cuboid by a formula.

Ex. 11.8.2 – Cube

In this, you will find the volume of a cube by a formula.

Ex. 11.8.3 â€“ Cylinder

In this, you will find the volume of a cylinder by a formula.

Ex. 11.9 – Volume and Capacity

In this you will study about Volume and capacity are one and the same thing. Volume is the amount of space occupied by shape, capacity is the quantity that a container can hold.

### Some questions from NCERT Solutions for Class 8 Maths Chapter 15 – Mensuration

Q.1. In a stack, there are 5 books each of thickness 20mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack?Â

SolutionÂ

Thickness of 5 books = 5 Ã— 20 = 100 mmÂ

Thickness of 5 paper sheets = 5 Ã— 0.016 = 0.080 mmÂ

Total thickness of stack = 100 + 0.080 = 100.08 mmÂ

= 1.0008 Ã— 102Â

Q.2. A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet,Â

(i) determine the area of the sheetÂ

(ii) the cost of the sheet for it, if a sheet measuring 1 m2 costs Rs.20.Â

SolutionÂ

= [2 Ã— 1.5 Ã— 0.65 + 2 Ã— 1.25 Ã— 0.65 + 1.5 Ã— 1.25] m2Â

= (1.95 + 1.625 + 1.875)m2 = 5.45 m2Â

1. ii) Cost of sheet per m2 area = Rs. 20Â

Cost of sheet of 5.45m2 area = Rs. 5.45 Ã— 20Â

= Rs. 109Â

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