if the diameter of the circle is 6.5 cms,
then the area of the circle is ((6.5 / 2)^2) * 3.14159 = 33.183 sq. cms.
.
calculation for circle area is:
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radius squared * pi (a constant 3.14159)
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650/10 = 65 centimeters
65 centimeters = 2.132 545 931 8 feet (value in feet)= (value in centimeters)/30.48 = (65)/30.48 =2.13
65 is a not perfect square.
65 inches equals 165.1 centimeters.
The square root of 65 is approximately 8.06