# Trigonometry

Free Math Games & Activities for Kids

**Trigonometry** is a branch of mathematics.
Trigonometry studies the relationships between side lengths and
angles of triangles. There are six ratios including sine, cosine,
tangent, cosecant, secant and cotangent. These six
trigonometry ratios are abbreviated as sin, cos, tan, csc, sec, and
cot. These are referred to as ratios since they can be expressed in
terms of the sides of a right angled triangle for a specific angle.

**
Trigonometric functions**

Trigonometric functions are functions related to an angle. There are six
trigonometric functions: sine, cosine, tangent and their reciprocals cosecant,
secant, and cotangent, respectively. Sine, cosine, and tangent are the most
widely used trigonometric functions. Their reciprocals, though used, are less
common in modern mathematics. Trigonometric functions are also called circular
functions.

There are two main ways in which trigonometric functions are typically
discussed: in terms of right triangles and in terms of the unit
circle. The right-angled triangle definition of trigonometric
functions is most often how they are introduced, followed by their definitions
in terms of the unit circle.

Trigonometry Explained step-by-step in PDF form

Simplified version how to learn trigonometry

Free downloadable college trigonometry math book

YouTube video explaining trigonometry math ideas

Classroom Lesson Plan common core math ANGLES

Common core math grade 3-5 lesson plan for measuring angles

Perimeter and Area

Geometry games (Shodor Interactive)

Shape Games

Planarity

Angles

Coordinates

Triangles

Squares

Polygons

Free Presentations in PowerPoint format