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A chord is 8 long and its sagitta is 2. The radius of the circle is
A6 units
B4 units
C5 units
D10 units
Answer & Solution
Correct answer: C. 5 units
With half chord 4, r^2 = 16 + (r - 2)^2 gives 4r = 20, so r = 5.
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