新GRE数学常见符号英文表达：
= is equal to
is not equal to
is approximately equal to
is greater than
is greater than or equal to
is less than
is less than or equal to
根号 square root
0.888888 the repeating decimal
r st r degrees s minutes t seconds
angle
∟ right angle
┻ is perpendicular
│x│ absolute value of x
∥ is parallel to
△ triangle
～ is similar to
≌ is congruent to
△x delta x
pi
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