Chapter - 10 Mensuration

1. Perimetre shapes

• = 12 cm + 16 cm + 18 cm + 10 cm + 14 cm = 71

• = 12 cm + 16 cm + 18 cm + 10 cm + 14 cm = 73

• = 12 cm + 16 cm + 18 cm + 10 cm + 14 cm = 70

• = 12 cm + 16 cm + 18 cm + 10 cm + 14 cm = 60

2. Perimetre Shapes

• 21 cm + 32 cm + 43 cm + 54 cm + 65 cm + 76 cm = 291

• 21 cm + 32 cm + 43 cm + 54 cm + 65 cm + 76 cm = 292

• 21 cm + 32 cm + 43 cm + 54 cm + 65 cm + 76 cm = 293

• 21 cm + 32 cm + 43 cm + 54 cm + 65 cm + 76 cm = 290

True or False:

3. Mensuration is the branch of mathematics

that deals with the measurement of length,

area or volume of various geometric shapes.

• True

• False

True Or False:

4. The amount of surface enclosed by a closed figure is

called its Sq cm.

• True

• False

True or False:

12 cm and 7 cm

• True

• False

A rectangle is a closed figure with ________ of equal opposite

sides.

• Three Pairs

• Two Pairs

• Four Pairs

• Five Pairs

Formula for perimeter of rectangle

• Perimeter of a Rectangle = Sum of all sides

  
  

  = length + breadth + length + breadth

  
  

  = 4 x length + 4 x breadth

  
  

  = 2 x (length + breadth)

• Perimeter of a Rectangle = Sum of all sides

  
  

  = length + breadth + length + breadth

  
  

  = 2 x length + 2 x breadth

  
  

  = 2 x (length + breadth)

• Perimeter of a Rectangle = Sum of all sides

  
  

  = length + breadth + length + breadth

  
  

  = 8 x length + 8 x breadth

  
  

  = 2 x (length + breadth)

• Perimeter of a Rectangle = Sum of all sides

  
  

  = length + breadth

  
  

  = 2 x length + 2 x breadth

  
  

  = 2 x (length + breadth)

What is Regular Closed Figure?

• Figures with equal length of sides and an equal measure of angles are known as Regular Closed Figures or Regular Polygons.

• Figures with equal length of sides and an equal measure of angles are known as Regular Open Figures or Regular Polygons.

• Figures with equal length of sides and an equal measure of angles are known as Square Closed Figures or Regular Polygons.

• Figures with equal length of sides and an equal measure of angles are known as Triangle Closed Figures or Regular Polygons.

Square is a regular polygon with _______ sides.

• 5

• 4

• 3

• 2

An equilateral triangle is a regular polygon with ______ equal sides and angles.

• Three

• Two

• Five

• Six