Sine Calculator

# 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