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LOGO Area and Perimeter of a Square By M.Veerasakdi

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What shape is this?

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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.

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

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

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Example Question Look at the 7cm × 7cm square below: a) What is the area of the square? b) What is the perimeter of the square?

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LOGO Area of Square Area of Square Area of Square Area of Square Square Area = a 2 Square a = length of side Square Square Perimeter = 4 x a Square a = length of side

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Word Problem : Page 210. 4) Perimeter = 2 x(Length + Width) = 2 x ( 60 + 45 ) = 2 x ( 60 + 45 ) = 210 m. Ans.* = 210 m. Ans.*

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5) Area = Length x Width 96 = Length x 8 96 = Length x 8 96 ÷ 8 = Length 96 ÷ 8 = Length Length = 12 cm. Ans. Length = 12 cm. Ans.

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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.

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Exercise 13.2 Page 212 - 213 1)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.

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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.

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3 *) 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.*

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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.

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NoLengthAreaPerimeter 1.1.1.1.86432 2.74928 3.52520 486432 5.63624 6.98136 7.1214448

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NoLengthAreaPerimeter 8.98136 9.86432 10.41616

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Solve the following …. Page 214-215 *1 ) Area = Length x Length = 5 x 5 = 5 x 5 = - cm. sq.Ans. = - cm. sq.Ans. 2 ) Area = Length x Length 64 = - x - 64 = - x - = 8 cm.Ans. = 8 cm.Ans.

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3 ) Area = Length x Length 225 = 15 x 15 225 = 15 x 15 Length = 15 cm.Ans. Length = 15 cm.Ans. Perimeter = 4 x Length = 4 x 15 = 4 x 15 = - cm.Ans. = - cm.Ans.

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4) Area = Length x Length 64 = - x - 64 = - x - Length = - m. Length = - m. 5 ) Perimeter = 56 2 times = 56 x 2 2 times = 56 x 2 = - m. = - m.

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6 ) Perimeter = 4 x Length 120 ÷ 4 = Length 120 ÷ 4 = Length - m. = Length Ans. - m. = Length Ans.

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www.themegallery.com LOGO 6) Area = Length x Length = 30 x 30 = 30 x 30 = - m.sq. Ans. = - m.sq. Ans.

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LOGO www.themegallery.com

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EXAMPLE 2 Rewrite a formula with three variables SOLUTION Solve the formula for w. STEP 1 P = 2l + 2w P – 2l = 2w P – 2l 2 = w Write perimeter formula.

EXAMPLE 2 Rewrite a formula with three variables SOLUTION Solve the formula for w. STEP 1 P = 2l + 2w P – 2l = 2w P – 2l 2 = w Write perimeter formula.

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