The study of how the angles and lengths of a triangle relate to each other.

Useless bullshit that you'll forget the second you graduate from high school.

Geometry and Advanced Algebra got together, and had a baby, named it Trigonometry, and then it grew up. Now it is on tons of steriods and wants to eat you. Commonly called "Trig"

Illuminati training for high school students. Can also be shortened to trig.

(n.) A set of mathematical rules that enable one to find the angles of a triangle from one other angle and the length of sides, or vice versa. Operates with the help of sine, cosine and tangent (which are actually ratios, but since kids nowdays have scientific calculators nobody cares), and is used in the real world for measuring the height of a structure without expensive equipment. See also cosine rule and pythagoras' threorum

geometry

the act of measuring the length of your penis tip during a doggy style sex.

Something you do in maths