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
$$ s = \frac{1}{2}(a + b + c) \tag{3}$$
Mathematical rules and laws - numbers, areas, volumes, exponents, trigonometric functions and more.
Calculate angles with a straight board across carpenter's square.
The laws of fractional and integer exponents.
The product of all positive integers.
Law of fractions
One side of a triangle when the opposite angle and two sides are known.
Triangles and law of tangents.
Verifying square corners.
Right angled triangle equations.
A rectangle is square if the lengths of both diagonals are equal.
Equations for differentials and integrals.
Function as an infinite sum of terms.
Triangle analytical geometry.
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