Law of Sines
Calculate the angles in a generic triangle.
The "Law of Sines" can be used to calculate the angles of a triangle.
The "Law of Sines" can be expressed as
$$ {a \over sin A } = {b \over sin B } = {c \over sin C } \tag{1}$$
where
a, b and c = length of sides in triangle (m, ft ...)
A, B and C = angles in the triangle (degrees)
Law of Sines Calculator
Eq. 1 can be modified to
$$ a = {b sin A \over sin B } = {c sin A \over sin C } \tag{1a}$$
$$ b = {a sin B \over sin A } = {c sin B \over sin C } \tag{1b}$$
$$ c = {a sin C \over sin A } = {b sin C \over sin B } \tag{1c}$$
This expression can also be handy:
$$ sin \frac{1}{2}A = \sqrt{{(s  b)(s  c) \over b c }} \tag{2}$$
where
$$ s = \frac{1}{2}(a + b + c) \tag{3}$$
Related Topics

Mathematics
Mathematical rules and laws  numbers, areas, volumes, exponents, trigonometric functions and more.
Related Documents

Angle Calculator  Carpenter's Square
Calculate angles with a straight board across carpenter's square. 
Exponents  Powers and Roots
The laws of fractional and integer exponents. 
Factorials
The product of all positive integers. 
Fractions
Law of fractions 
Law of Cosines
One side of a triangle when the opposite angle and two sides are known. 
Law of Tangents
Triangles and law of tangents. 
Pythagorean Theorem
Verifying square corners. 
Right Angled Triangle
Right angled triangle equations. 
Squaring with Diagonal Measurements
A rectangle is square if the lengths of both diagonals are equal. 
Standard Differentials and Integrals
Equations for differentials and integrals. 
Taylor Series
Function as an infinite sum of terms. 
Triangle
Triangle analytical geometry.