Sine Calculator

Trigonometric sine calculator. Sine rule. Sine table.

# What is Sine

In trigonometry (for acute angles only), the tangent of a right-angled triangle is defined as "the ratio of the length of the opposite side to the length of the hypotenuse".

Sinθ = a / c

Due to its relation with cos and tan, it can also be calculated by:

Sinθ = Cosθ × Tanθ

# Law of sines (or sine rule)

Rule for finding Sides

a / sin A = b / sin B = c / sin C

Rule for finding Angles

sin A / a = sin B / b = sin C / c

# Sine graph

Graphical demonstration of sine function (graph of sine)

# Sine table

Degrees
Radians
sin

0
0
0

30
π / 6
1 / 2

45
π / 4
1 / √2

60
π / 3
√3 / 2

90
π / 2
1

180
π
0

270
3π / 2
-1

360
0