SAT Subject Test Mathematics Level 1

4 . B

When    you rotate  a   right   triangle    about   a   leg,    you get a   cone:

One leg becomes the base    radius, and the other   becomes the height  of

the cone.   Call    the long    leg a   and the short   leg b   and plug    them    into    the

cone    volume  formula:

It’s    also    given   that    the area    of  the right   triangle    is  3,  so

Plug    ab  =   6   into    the expression  for the volume  of  the cone    and you can

solve   for a: