Geometry Symbols Cheat Sheet Symbol Meaning A β‘π΄π΅ Μ Μ Μ Μ π΄π΅ π΄π΅ = 5 point A line AB line segment AB the length of segment AB is 5 ray AB π΄π΅ β π΄π΅ ∠ ∠πΉπΆπΈ π∠πΉπΆπΈ = 54° ° β‘ β₯ π΅πΈ β‘ π΄π· β‘ ⊥ π΄π΅ β‘ π΄π· β ≅ ~ ≈ π arc AB angle angle FCE measure of angle FCE is 54° degrees line AD is parallel to line BE line AD is perpendicular to line AB triangle congruent similar approximately theta (variable for an angle)