Answer:
6.9 cm
Step-by-step explanation:
The triangle inscribed into the circle is a right triangle, the hypotenuse is twice the radius, thus we can use Pythagora's theorem to solve for the remaining side:
[tex]a^2+b^2=c^2\\4^2+b^2=8^2\\16+b^2=64\\b^2=48\\b=\sqrt{48} \\b=6.92820323028...[/tex]
Round to the nearest tenth to get 6.9 cm.
