Answer:
Option (C)
Step-by-step explanation:
In the given circle, AB is a chord passing through the center O.
Therefore,chord AB is a diameter of the circle and OC is the radius.
AO = OB = OC
OC⊥AB, and length of OC = 7 cm
By applying Pythagoras theorem in right ΔBOC,
BC² = OC² + OB²
BC = [tex]\sqrt{OC^{2}+OB^{2}}[/tex]
   = [tex]\sqrt{7^2+7^2}[/tex]
   = [tex]7\sqrt{2}[/tex]
   ≈ 9.9 units
Therefore, Option (C) will be the answer. Â
