If the length of the longest chord of a certain circle is 10, what is the radius of that certain circle?	Answers
A) 2.5 B) 5 C) 10 D) 15 E) 20

Rationale: longest chord of a circle is the diameter of the circle diameter = 2 * radius if diameter of the circle is given as 10 = 2 * 5 so radius of the circle = 5 correct answer - b
Answer: B