SAT Subject Test Mathematics Level 2

6 . C

As  is  so  often   true    when    circles are combined    with    other   figures,    the key to  solving this

question    is  to  draw    in  a   radius:

All the radii   of  a   circle  are equal,  so  within  each    of  the two triangles   you just    created,    the

angles  opposite    the radii   are equal:

Now that    you know    two angles  in  each    triangle,   you can figure  out the third: