Symbol Symbol Name Meaning / definition Example

∠ angle formed by two rays ∠ABC = 30°

measured angle ABC = 30°

spherical angle AOB = 30°

∟ right angle = 90° α = 90°

° degree 1 turn = 360° α = 60°

deg degree 1 turn = 360deg α = 60deg

′ prime arcminute, 1° = 60′ α = 60°59′

″ double prime arcsecond, 1′ = 60″ α = 60°59′59″

line infinite line

AB line segment line from point A to point B

ray line that start from point A

arc arc from point A to point B = 60°

⊥ perpendicular perpendicular lines (90° angle) AC ⊥ BC

| | parallel parallel lines AB | | CD

≅ congruent to equivalence of geometric shapes and size ∆ABC≅ ∆XYZ

~ similarity same shapes, not same size ∆ABC~ ∆XYZ

Δ triangle triangle shape ΔABC≅ ΔBCD

| x – y | distance distance between points x and y | x – y | = 5

π pi constant π = 3.141592654…

is the ratio between the circumference and diameter of a circle c = π · d = 2· π · r

rad radians radians angle unit 360° = 2π rad

radians radians angle unit 360° = 2π

grad gradians / gons grads angle unit 360° = 400 grad

gradians / gons grads angle unit 360° = 400

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