mensuration formulas class 8 cube

CUBE:

In a solid all three lengths are equal and right angle to each other it is called cube.

CubeSolids like ice cubes, sugar cubes, dice, etc., are in the shape of a cube.

  For cube having each edge = a units, we have

• Volume a3 cubic units
• Total surface area = 6a2sq units
• Lateral surface area = 4a2sq units

 SOLVED EXAMPLES

question The total surface area of a cube is 216 cm2.Find its volume

Solution: Let each side of the cube be a cm.

Then, the total surface area of the cube =  (6a)2 cm2.

∴ 6a2 = 216 ⇔ a2 = 36 ⇔ = 6

Volume of the cube = a3 cubic units

= ( 6× 6 × 6) cm3 = 216 cm3.

question The volume of cube is 4096 cm3.Find its total surface area

Solution: Let each side of the cube be a cm.

Then, the volume of the cube = a3cm3

∴ a3= 4096⇔ a = 16

the total surface area of the cube =  (6a)2 cm2.

= 6×162

=  1536 cm2

CBSE NCERT Solutions for Class 8 Maths

class 8 maths NCERT solutions Chapter 1: Rational Numbers

class 8 maths NCERT solutions  Chapter 2: Linear Equations in One Variable

class 8 maths NCERT solutions  Chapter 3: Understanding Quadrilaterals

class 8 maths NCERT solutions Chapter 4: Practical Geometry

class 8 maths NCERT solutions  Chapter 5: Data Handling

class 8 maths NCERT solutions  Chapter 6: Square and Square Roots

class 8 maths NCERT solutions  Chapter 7: Cube and Cube Roots

class 8 maths NCERT solutions  Chapter 8: Comparing Quantities

NCERT Class 8 Maths solution Chapter 9: Algebraic Expressions and Identities

class 8 maths NCERT solutions  Chapter 10: Visualizing Solid Shapes

class 8 maths NCERT solutions Chapter 11: Mensuration

class 8 maths NCERT solutions  Chapter 12: Exponents and Powers

class 8 maths NCERT solutions  Chapter 13: Direct and Inverse Proportions

class 8 maths NCERT solutions  Chapter 14: Factorization

class 8 maths NCERT solutions  Chapter 15: Introduction to Graphs

class 8 maths NCERT solutions  Chapter 16: Playing with Numbers

Notes,worksheet and solved question for Maths class 8 

1.  class 8 maths notes on chapter Liner equation in one variable
2. class 8 maths notes on chapter algebric expression 
3. class 8 maths notes on chapter Mensuration 
4. class 8 maths notes on chapter Square and square roots 
5. class 8 maths notes on chapter statistice
6. class 8 maths notes on chapter practical Geometry
7. class 8 maths notes on chapter commericial maths
8. class 8 maths notes on chapter solid shape
9. class 8 maths notes on chapter quadrilaterals
10. class 8 maths notes on chapter exponents
11. class 8 maths notes on chapter factorisation 
12. class 8 maths notes on chapter inverse proporation 
13. class 8 maths notes on chapter cube and cube roots 

Check your marks in a chapter which you have complited in school from Physics Wallah chapter wise online test just click on the link given below

chapter wise online test for class 8 maths