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Symbol: ∠
Symbol Name: angle
Meaning / definition: formed by two rays
Example: ∠ABC = 30°
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Symbol: deg
Symbol Name: degree
Meaning / definition: 1 turn = 360deg
Example: α = 60deg
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Symbol: ′
Symbol Name: prime
Meaning / definition: arcminute, 1° = 60′
Example: α = 60°59′
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Symbol: ″
Symbol Name: double prime
Meaning / definition: arcsecond, 1′ = 60″
Example: α = 60°59′59″
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Symbol: AB
Symbol Name: line segment
Meaning / definition: line from point A to point B
Example:
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Symbol: 
Symbol Name: arc
Meaning / definition: arc from point A to point B
Example: = 60°
= 60°Permalink: URL
Symbol: ⊥
Symbol Name: perpendicular
Meaning / definition: perpendicular lines (90° angle)
Example: AC ⊥ BC
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Symbol: ∥
Symbol Name: parallel
Meaning / definition: parallel lines
Example: AB ∥ CD
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Symbol: ≅
Symbol Name: congruent to
Meaning / definition: equivalence of geometric shapes and size
Example: ∆ABC≅ ∆XYZ
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Symbol: ~
Symbol Name: similarity
Meaning / definition: same shapes, not same size
Example: ∆ABC~ ∆XYZ
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Symbol: Δ
Symbol Name: triangle
Meaning / definition: triangle shape
Example: ΔABC≅ ΔBCD
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Symbol: │x-y│
Symbol Name: distance
Meaning / definition: distance between points x and y
Example: │ x-y │ = 5
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Symbol: π
Symbol Name: pi constant
Meaning / definition: π = 3.141592654...
is the ratio between the circumference and diameter of a circle
Example: c = π⋅d = 2⋅π⋅r
Permalink: URL
Symbol: rad
Symbol Name: radians
Meaning / definition: radians angle unit
Example: 360° = 2π rad
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