A circle having centre \( \mathrm{O} \) at the diagonal of the unit square passes through poin... VIDEO
A circle having centre \( \mathrm{O} \) at the diagonal of the unit square passes through points \( \mathrm{A} \) and \( \mathrm{B} \) that trisect the given diagonal. Find the radius of the circle.
a. \( \frac{1}{8 \sqrt{3}} \)
b. \( \frac{1}{6 \sqrt{2}} \)
c. \( \frac{1}{3 \sqrt{3}} \)
d. \( \frac{1}{3 \sqrt{2}} \)
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