The radius of a semi circle is 3.5 cm then its perimeter is?	Pick.
A) 32.8	B) 32.4	C) 32.1	D) 18	E) 32.9

Rationale: "diameter = 7 cm 1 / 2 * 22 / 7 * 7 + 7 = 18 answer : d"
Answer: D