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Area and Perimeter Area and Perimeter of a Squareof a Square

Area and Perimeter Area and Perimeter of a Squareof a Square

By M.VeerasakdiBy M.Veerasakdi

What shape is this?What shape is this?

Quadrilaterals

The area of a square with sides of length 1cm is 1cm².

The area of a square with sides of length 1cm is 1 cm². The area of a square with sides of length 1cm is 1 cm².

The area of other The area of other ssquares can be found by counting quares can be found by counting squares or by multiplying the length of the sides. squares or by multiplying the length of the sides.

The perimeter of a square is the total length of the The perimeter of a square is the total length of the four sides. four sides.

Example QuestionExample Question

Look at the 7cm × 7cm square below: Look at the 7cm × 7cm square below:

a) What is the area of the square?a) What is the area of the square?

b) What is the perimeter of the square?b) What is the perimeter of the square?

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Area of SquareArea of SquareArea of SquareArea of Square

SquareSquareArea = aArea = a22

a = length of sidea = length of side

SquareSquarePerimeter = 4 x a Perimeter = 4 x a

a = length of sidea = length of side

Word Problem : Page 210.Word Problem : Page 210.

4) Perimeter = 2 x(Length + Width)4) Perimeter = 2 x(Length + Width)

= 2 x ( 60 + 45 )= 2 x ( 60 + 45 )

= 210 m. Ans.= 210 m. Ans.**

5) Area = Length x Width5) Area = Length x Width

96 = Length x 896 = Length x 8

96 ÷ 8 = Length96 ÷ 8 = Length

Length = 12 cm. Ans.Length = 12 cm. Ans.

6 ) Perimeter = 2 x (Length + Width)6 ) Perimeter = 2 x (Length + Width)

48 = 2 x (16+Width )48 = 2 x (16+Width )

48 = 32 + 2 Width 48 = 32 + 2 Width

(48 – 32) ÷ 2 = Width (48 – 32) ÷ 2 = Width

Width = 8 cm. Ans.Width = 8 cm. Ans.

Exercise 13.2 Page 212 - 213Exercise 13.2 Page 212 - 213

1)1) Perimeter = 4 x Length Perimeter = 4 x Length

= 4 x 6 = 4 x 6

= 24 cm. Ans.= 24 cm. Ans.

Area = Length x Length Area = Length x Length

= 6 x 6 = 6 x 6

= 36 sq.cm. Ans.= 36 sq.cm. Ans.

2 ) Perimeter = 4 x Length 2 ) Perimeter = 4 x Length

= 4 x 12 = 4 x 12

= - cm. Ans.= - cm. Ans.

Area = Length x Length Area = Length x Length

= 12 x 12 = 12 x 12

= - cm.sq. Ans.= - cm.sq. Ans.

3 3 **) Perimeter = 4 x Length ) Perimeter = 4 x Length

= 4 x 20 = 4 x 20

= - cm. Ans.= - cm. Ans.

Area = Length x Length Area = Length x Length

= 20 x 20 = 20 x 20

= - cm.sq. Ans.= - cm.sq. Ans.**

4 ) Perimeter = 4 x Length 4 ) Perimeter = 4 x Length

= 4 x 30 = 4 x 30

= - cm. Ans.= - cm. Ans.

Area = Length x Length Area = Length x Length

= 30 x30= 30 x30

= - cm.sq. Ans.= - cm.sq. Ans.

NoNo Length Length AreaArea PerimeterPerimeter

11.. 88 6464 3232

2.2. 77 4949 2828

3.3. 55 2525 2020

44 88 6464 3232

5.5. 66 3636 2424

6.6. 99 8181 3636

7.7. 1212 144144 4848

NoNo Length Length AreaArea PerimeterPerimeter

8.8. 99 8181 3636

9.9. 88 6464 3232

10.10. 44 1616 1616

Solve the following …. Page Solve the following …. Page 214-215214-215

**1 ) Area = Length x Length1 ) Area = Length x Length = 5 x 5= 5 x 5 = - cm. sq.Ans.= - cm. sq.Ans.

2 ) Area = Length x Length 2 ) Area = Length x Length 64 = - x - 64 = - x - = 8 cm.Ans.= 8 cm.Ans.

3 ) Area = Length x Length 3 ) Area = Length x Length 225 = 15 x 15225 = 15 x 15 Length = 15 cm.Ans.Length = 15 cm.Ans.

Perimeter = 4 x Length Perimeter = 4 x Length = 4 x 15 = 4 x 15 = - cm.Ans.= - cm.Ans.

4)4) Area = Length x Length Area = Length x Length

64 = - x - 64 = - x -

LengthLength = - m.= - m.

5 ) Perimeter = 565 ) Perimeter = 56 2 times = 56 x 2 2 times = 56 x 2 = - m.= - m.

6 6 ) Perimeter = 4 x Length ) Perimeter = 4 x Length

120 ÷ 4 = Length 120 ÷ 4 = Length

- m. = Length Ans.- m. = Length Ans.

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6)6) Area = Length x Length Area = Length x Length

= 30 x 30 = 30 x 30

= - m.sq. Ans.= - m.sq. Ans.

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