All geometry symbols I could think of are compiled on this page. If you did not find the symbol you were looking for, kindly email and I will add it to this list.
Symbols Meaning of the symbols
Therefore
If x then y
is congruent to
is not congruent to
is similar to
Angle with vertex A
refers to angles(more than one)
Measure of angle A in degree(s)
^{°} Degree(s)
n
^{° } n degree(s)
is perpendicular to
is not perpendicular to
|| is parallel to
is not parallel to
∟ right angle sign
∆ABC Triangles with vertices A, B, and C;
refers to triangles (more than one)
Parallelogram with vertices A,B,C,and D
refers to Parallelograms( more than one)
circle with center A
AB Segment with endpoint A and B
AB Length of segment
AB
Ray AB with endpoint A passing through B
Line through points A and B
π Ratio of circumference to diameter of a circle.
s Usually Length of a side
b length of a base
A Area
h height of a figure
d diameter of a circle
r radius of a circle
P perimeter
C circumference
B Area of base
L.A. Lateral area
S.A. surface area
V volume
l slant height
a apothem
b
_{1}, b
_{2} bases of a trapezoid (parallel sides)
n-gon polygon with n sides
Arc with endpoints A and B
Arc with endpoints A and C containing B
measure of arc AB