The Six Trigonometric Ratios Explained

Now, let us define the six trigonometric ratios. The first ratio

is sine, which is written as "sin". Sine of an angle is equal to perpendicular

divided by hypotenuse. The second ratio is cosine, written as "cos". Cosine of an angle

is equal to base divided by hypotenuse. The third ratio is tangent, written as "tan".

Tangent of an angle is equal to perpendicular divided by base. The next three ratios are reciprocals

of sine, cosine, and tangent. Cosecant, written as "cosec",

is equal to hypotenuse divided by perpendicular. Secant, written as "sec", is equal to hypotenuse

divided by base. Cotangent, written as "cot", is equal to base divided by perpendicular.