If the length of the longest chord of a certain circle is 22, what is the radius of that certain circle?  Choose the correct choice from the following:
A) 11
B) 5
C) 10
D) 15
E) 20
Longest chord of a circle is the diameter of the circle   diameter = 2 * radius   If diameter of the circle is given as 22 = 2 * 11   so radius of the circle = 11   correct answer - 11
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If the length of the longest chord of a certain circle is 22, what is the radius of that certain circle?