Geometry Symbols
Geometry (Ancient Greek: geo "earth", metria "measurement") is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space. It is one of the oldest mathematical sciences. Initially a body of practical knowledge concerning lengths, areas, and volumes, in the 3rd century BC, Geometry was put into an axiomatic form by Euclid, whose treatment—Euclidean geometry—set a standard for many centuries to follow. Archimedes developed ingenious techniques for calculating areas and volumes, in many ways anticipating modern integral calculus. The field of astronomy, especially mapping the positions of the stars and planets on the celestial sphere and describing the relationship between movements of celestial bodies, served as an important source of geometric problems during the next one and a half millennia. A mathematician who works in this field is called a geometer.Note : During the proofs in geometry congruence of triangle, if we mark the same sign on sides of two different triangles that means that two sides are congruent with each other.Similarly, if the same sign on angles of two different triangles or same triangles then that two angles are congruent to each other.




1) ∠  Angle  formed by two rays  ∠ABC = 60^{o} 
2) ⊾  Right angle  90^{o}  α = 90^{o} 
3) ≅  Congruent to  Equivalence of geometric shapes and size  ΔABC ≅ ΔPQR 
4) ⊥  Perpendicular  Perpendicular lines (90^{o} angle)  PQ ⊥ PR 
5) Δ  Triangle  Triangle shape  ΔABC = ΔXYZ 
6) →  Ray  Line that start from point.  
7) ^{o}  Degree.  1trun = 360^{o}  α = 60^{o} 
8) π  pi constant  π= 3.141592654...is the ratio between the circumference and diameter of a circle.  d = 2 πr 
9) ∥  Parallel  Parallel lines  AB ∥ PQ 
10) ∢  Spherical angle  ∢ ABC = 30^{o} 
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