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Ex 11.3, 9 - Shazli took a wire of length 44 cm and bent it into the

Ex 11.3, 9 - Chapter 11 Class 7 Perimeter and Area - Part 2
Ex 11.3, 9 - Chapter 11 Class 7 Perimeter and Area - Part 3 Ex 11.3, 9 - Chapter 11 Class 7 Perimeter and Area - Part 4

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Ex 9.2, 9 Shazli took a wire of length 44 cm and bent it into the shape of a circle. Find the radius of that circle. Also find its area. If the same wire is bent into the shape of a square, what will be the length of each of its sides? Which figure encloses more area, the circle or the square? (π‘‡π‘Žπ‘˜π‘’ πœ‹=22/7) Radius = r = ? Wire is bent into the shape of circle ∴ Length of wire = Circumference of circle 44 = 2πœ‹r 44 = 2 Γ— 22/7 Γ— r (44 Γ— 7)/44 = r 7 = r r = 7 cm ∴ Radius of given circle is 7 cm Area of circle Area of given circle = πœ‹r2 = 22/7 Γ— (7)2 = 22/7 Γ— 7 Γ— 7 = 154 cm2 ∴ Area of circle is 154 cm2 Wire is bent to form a square Side of square = a = ? As wire is bent into the shape of square Length of wire = Perimeter of square 44 = 4a 44/4 = a 11 = a a = 11 cm Area of square Area of square = a Γ— a = 11 Γ— 11 = 121 cm2 ∴ Area of square is 121 cm2 Now, Area of circle is 154 cm2 Area of square is 121 cm2 So, circle encloses more area than square

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.