1.

If the radius of a circle is 'a' units, which of the following is its circumference?

A.  \[\text{2 }\!\!\pi\!\!\text{ a units}\]   
B.  \[\text{ }\!\!\pi\!\!\text{ d units}\]       
C.      \[\text{2 }\!\!\pi\!\!\text{ d units}\]     
D.        \[\frac{\text{2 }\!\!\pi\!\!\text{ }}{a}\text{ units}\]
Answer» B.  \[\text{ }\!\!\pi\!\!\text{ d units}\]       


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