A circle is  seven eleventh of a square in area. If the diagonal of the square is 7.7 cm, the diameter of the circle is

 

 Let the area of square be x² m²

Circle's area = 7x² / 11

Diagonal of square is = side  * square root of 2 

7.7 cm = 7.7 / 100 = 0.077 m

0.077 = side *square root of 2

side = 0.077 / square root of 2

Area of sqaure = (0.077 / square root of 2)²

Area of square = 0.0029645 m²

Area of Circle = 7 * 0.0029645 / 11

aREA OF CIRLCE = 0.0018865

Pie * r *r = 0.0018865

r * r = 0.0018865 * 7 /22

r * r = 0.00060025

r = 0.0245

d = 0.245 * 2 = 

d= 0.049 m

d = 4.9 cm

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