opposite/adjacent.

c^2=a^2+b^2-2ab(cos

A measurement of plane angle, representing 1/360 of a full rotation.

Relates the tangent of one half of an angle to trigonometric functions of the entire angle.

adjacent/hypotenuse.

sin

Angle that bisects the angle formed by two halves of a straight line.

Trigonometric identity expressing the pythagorean theorem in terms of trigonometric functions.

opposite/hypotenuse.

a-b/a+b=tan[1/2(A-B)]/tan[1/2(A+B)]

Longest side of a right angled triangle.

A mathematical formula in complex analysis that establishes the deep relationship between the trigonometric functions and the complex exponential function.

"SOH-CAH-TOA"

Branch of mathematics that studies triangles and the relationships between the lengths of their sides and the angles between those sides.

A relation in Euclidean geometry among the three sides of a right angle, equation is a^2+b^2=c^2

A mathematical function defined to calculate the length of the hypotenuse of a right angle triangle.

You have two sides of a right triangle to find an angle. Use SOH-CAH-TOA to know when to you a certain inverse trig function.

a+b/c=cos(A-B/2)/sin(y/2) and a-b/c=sin(A-B/2)/cos(y/2)

One of the basic shapes in geometry: polygon with three vertices and three sides which are line segments.

A medieval technique of navigational computation that uses compass direction, distance and a simple trig table known as the toleta de marteloio.