Trigonometry, abbreviated as TRIG, is a branch of mathematics that deals with the relations between the sides and angles of plane or spherical triangles.  For other math terms see Algebra and Geometry.

Mathematics Symbols

• See Algebra Symbols / Angle and Line Symbols / Basic Math Symbols / Bracket Symbols / Equivalence Symbols / Geometry Symbols / Greek Alphabet / Miscellaneous Symbols / Roman Numerals / Set Symbols / Square Root Symbols

Mathematics Terms

• See Algebra, Geometry

Nomenclature & Symbols for Engineering, Mathematics, and Science

• See A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

Trigonometry Terms

• See A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

A

• Arccos - The inverse cosine.

• Arccot - The inverse cotangent.

• Arccsc - The inverse cosecant.

• Arcsec - The inverse secant.

• Arcsin - The inverse sine.

• Arctan - The inverse tangent.

C

• Cosecant (csc, cosec) - The ratio of the hypotenuse over opposite side in a right triangle.

• Cosine (cos) - The ratio of the adjacent side of the hypotenuse in a right triangle.

• Cotangent (cot, ctg) - The ratio of the adjacent side to the oposite in a right triangle.

D

E

F

G

H

• Heron's formula  -  A formula for the area of a triangle when the lengths of the three sides are known.

• Hyporenuse - The side of right triangle opposite the right angle, which is the longest side.

I

• Infinite - Having no boundary.

• Inverse statement  -  Disaliow both the hypohesis and conclusion of the origional statement.

J

K

L

• Law of cosines - An equation relating to cosine of an interior angle and the lengths of the sides of a triangle.

• Law of sines - The ratio of the sine of any angle within any specific triangle and the length for the opposite side is a constant.

M

N

O

• Orthocenter - The point of concurrence of the altitudes of the triangle.

• Orthogonal - Perpendicular to a plane.

P

• Pythagorean theorem - An equation relating the lengths of the sides of a right triangle.  The sum of the squares of the legs of a right triangle is equal to the square of the hypotenuse.

• Proportional - In a constant ratio.

Q

R

• Ratio - A constant proportion or two real numbers divided by each other.

S

• Sine (sin) - The ratio of the length of the opposite side to the length of the hypotenuse.

T

• Tangent (tan) - The ratio of the opposite side to the adjacent side of a right triangle.

• Tangent line - A line that touches the graph of the function at a single point.

• Tangent of a circle - A line that contacts an arc or circle at only one point.

• Trig functions - sine, cosine, tangent, cosecant, secant, and cotangent

U

V

W

X

• X-axis - The horizontal axis on a coordinate system.

Y

• Y-axis - The vertical axis on a coordinate system.

Z