What is the length of diagnoal of 7-by-7 square. (round to nearest tenth).​

9.9

Step-by-step explanation:

We can use the Pythagorean theorem to solve.  The legs are both 7 and we are booking for the hypotenuse

a^2 +b^2 = c^2  where a and b are the legs and c is the hypotenuse

7^2+7^2 = c^2

49+49 = c^2

98 =c^2

Taking the square root of each side

sqrt(98) = sqrt(c^2)

9.899494937=c

9.9 = c

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.