Triangle Formulas

In this lesson we learn:
- Law of sines: Relating angles and opposite sides for any triangle
- Triangulation: Real-world application of the law of sines to find distances
- Law of cosines: Relating three sides and an angle for any triangle
- Triangle area (SAS): Find a triangle's area using 2 sides and the angle between

Triangle has sides of lengths a, b, and c opposite the angles A, B, and C then:
a/sin A = b/sin B = c/sin C
Triangle has sides of lengths a, b, and c opposite the angles A, B, and C then:
c^2 = a^2 + b^2 − 2ab cos C

Law of sines - Triangulation |Triangle Formulas – Trigonometry: 

Law of cosines - Triangle area (SAS) |Triangle Formulas – Trigonometry: