Question 1198218
A chord of a circle is 9cm long. 
if it's distance from the centre of the circle is 5cm,calculate the radius of the circle
:
draw this as described, the line distance from the center bisects the chord, forming two identical right triangles with sides of 4.5 and 5, the radius, then, will be the hypotenuse (r)
:

{{{r = sqrt(4.5^2 + 5^2)}}}
r = 6.7268