if r is radius of a circle and perimeter of circle is 12π.calculate r+2r-(r/2).	Choose the correct choice from the following choices
A) 15	B) 10	C) 12	D) 6	E) 18
perimeter of circle=2πr.   2πr=12π,r=6   r+2r-(r/2)   6+2*6-(6/2)   6+2*6-3   6+12-3   18-3= 
<gadget id="calculator">18-3</gadget>
<output>15</output>
15   answer 15
<result>A</result>
if r is radius of a circle and perimeter of circle is 12π.calculate r+2r-(r/2).