Q. 24.1( 56 Votes )

Find the followin

Answer :

(i) Let r be the radius of a circle.


Circumference of circle = 2πr


Ratio of radius to circumference of circle = r/2πr


= 1/2π


= 1 : 2π


(ii) Let r be the radius of a circle.


Circumference of circle = 2πr


Area of the circle =2πr2


Ratio of radius to circumference of circle = 2πr/πr2


= 2/r


= 2 : r


(iii) Side of square = 7 cm


Diagonal of square = √2 × side = 7√2 cm


Ratio of diagonal of a square to its side = 7/7√2


= 1/√2


= 1 : √2


(iv) Length of rectangle = 5 cm


Breadth of rectangle = 3.5 cm


Perimeter of rectangle = 2(Length + Breadth)


= 2(5+3.5)


= 2(8.5)


= 17 cm


Area of rectangle = Length × Breadth


= 5 × 3.5


= 16.5 cm2


Ratio of Perimeter to area of rectangle


= 17/16.5


= 170/165


= 34/33


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