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GRE MATH REVIEW #6 GeometryAs 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 (360o2.A line is a 180). o3.When two lines intersect, four angles are formed, and the sum of these angles is 360angle, i.e. a perfectly flat angle. 04.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 lookequal 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. xo xo