Degrees and Radians
Definitions and how to convert one to the other.|
Converts degrees, radians, revs, grads, mils, seconds and minutes.|
Right Triangle Calculator
Solves for any right triangle if you know one angle and the length of any side.|
Ultimate Triangle Calculator
This solves for ANY type of triangle as long as you know all 3 sides, 2 sides and an
included angle or 2 angles and an included side. (It calculates area too.)
Knowing all 3 angles, it will calculate the relative lengths of all 3 sides.|
Click here for the special case of side-side-angle.
30 60 90 and 45 45 90 Triangles
Calculator for these 2 types of special right triangles.|
Angular Size Calculator
Accurate for angles up to 180 degrees.|
Calculates all 6 trigonometry functions and all 6 arcfunctions.
If you need to know the cosecant of 1.37 radians, this is the calculator for you.|
Slope and Grade Calculator
Trigonometry in the real world. Explains and calculates how to determine a road grade, the pitch of a roof, etc.
Trigonometric Identities Tables of identities such as sin² (θ) + cos² (θ) = 1 sin (θ) = cos (90° -θ) tan (θ) = sin (θ) ÷ cos (θ) and so on.
A brief review of the basics of trigonometry.|
Trigonometry Tutorial Part 2
Solving Oblique Triangles by Using the Law of Sines and Cosines
Trigonometry Tutorial Part 3
Solving Oblique Triangles Without Using the Law of Sines and Cosines
Parts 2 and 3 explain solving triangles when you know all 3 sides; 2 sides and an included angle; 2 sides and a non-included angle; 2 angles and an included side
A graphic showing all 4 quadrants and which of the 6 trigonometric functions are either positive or negative in each quadrant.|
Types of Triangles
A chart showing triangles classified by angles
(acute, right, obtuse) and by sides (equilateral, isosceles, scalene).|
Also has triangle area formulas and a triangle area calculator.