SAT Subject Test Mathematics Level 1

10 . D

Mark    up  the figure. Because the triangles   are congruent,  ∠C  also

measures    60°.    And because they’re both    right   triangles,  ∠BDA    and ∠CAD

both    measure 30°:

Now you have    the other   two angles  inside  a   triangle    with    x,  so  you can

set their   sum equal   to  180 and solve   for x:

11 . C
To solve an equation with fractions, first multiply both sides by whatever
you have to to clear all denominators. In this case, multiply both sides by