1.2 KiB
1.2 KiB
Intro
Tl;dr, the law of sines is:
\frac{\sin(\alpha)}{a} = \frac{\sin(\beta)}{b} = \frac{\sin(\gamma)}{c}
Under convention:
-
Angle
\alphais opposite sidea -
Angle
\betais opposite sideb -
Angle
\gammais opposite sidec -
Any triangle that is not a right triangle is called an oblique triangle. There are two types of oblique triangles:
- Acute triangles: This is an oblique triangle where all three interior angles are less than
90\degreeor\dfrac{\pi}{2}radians. - Obtuse Triangle: This is an oblique triangle where one of the interior angles is greater than
90\degree.
- Acute triangles: This is an oblique triangle where all three interior angles are less than
Different types of oblique triangles
- ASA Triangle: (Angle Side Angle) - We know the measurements of two angles and the side between them
- AAS: We know the measurements of two angles and a side that is not between the known angles.
- SSA: We know the measurements of two sides and an angle that is not between the known sides.
These triangles can be solved by adding a line that goes from one vertex to intersect perpendicular to the opposite side, forming two right triangles (
h).
Solving for the law of sines
We know that \sin\alpha = \dfrac{h}{b}