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Symbols in Geometry

Common Symbols Used in Geometry

Symbols save time and space when writing. Here are the most common geometrical symbols:

Symbol Meaning Example In Words
triangle symbol Triangle triangleABC has 3 equal sides Triangle ABC has three equal sides
angle symbol Angle angleABC is 45° The angle formed by ABC is 45 degrees.
perpendicular Perpendicular ABperpendicularCD The line AB is perpendicular to line CD
parallel Parallel EFparallelGH The line EF is parallel to line GH
degrees Degrees 360° makes a full circle
right angle symbol Right Angle (90°) right angle is 90° A right angle is 90 degrees
line segment AB Line Segment "AB" AB The line between A and B
line AB Line "AB" line AB The infinite line that includes A and B
ray AB Ray "AB" ray AB The line that starts at A, goes through B and continues on
congruent Congruent (same shape and size) triangleABC congruent DEF
Triangle ABC is congruent to triangle DEF
similar Similar (same shape, different size) DEFsimilarMNO Triangle DEF is similar to triangle MNO
therefore symbol Therefore a=b therefore b=a a equals b, therefore b equals a

Naming Angles

For angles the central letter is where the angle is. For example when you see "angleABC is 45°", then the point "B" is where the angle is.

Short Example

  So now, when someone writes: In triangleABC, angleBAC is right angle
  You know they are saying:

"In triangle ABC, the angle BAC is a right angle"