GRE MATH REVIEW #6
Geometry
As in the case of algebra, you don’t need to know much of the actual geometry you
learned in your geometry class for the GRE. Here is a list of facts about
degrees and
angles
that you should know for the GRE:
1.
A circle contains 360 degrees (360
o
2.
A line is a 180
).
o
3.
When two lines intersect, four angles are formed, and the sum of these angles
is 360
angle, i.e. a perfectly flat angle.
0
4.
When two lines are perpendicular to each other, their intersection forms four
90
.
o
⊥
angles. The symbol used on the GRE to indicate perpendicularity is
.
5.
Ninety-degree angles are also called right angles. A right angle on the GRE is
identified by the following symbol:
6.
When two parallel lines, indicated by the symbol // , are cut by a third line,
angles that
look
equal
are
equal. This is easier to remember than the
definitions of corresponding exterior and interior angles that you learned in
geometry class. However, be careful when applying this rule since diagrams
in the GRE are often not drawn to scale. The following diagram is an example
to which this rule applies.
x
o
x
o