7^3×7^-5
7^(3-5)
7^-2
1/7^2
So the answer is c
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
We know that the line segment drawn from the center of circle to any chord , bisects the chord
So the other part fo the chord is also 6.5
And the radius is 8
, So we can now apply the pythagorean theorem , in the triangle
So



taking square root on both sides
x = 4.6637
x=4.7
Answer:
I have heard of it but I myself do not