Use the formula for the circle: area = pi x radius squared. Replace the area, and solve for the radius. Multiply the radius by 2 to get the diameter.
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13 x 13= 169
It is the square root of 169 which is 13 units of length
Yes because the square root of 169 is 13 which is a rational number
You find the square root 0f 169 which is 13.
y2 = 169 Square root both sides: y = 13