Non-right triangles & trigonometry
7 videos
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Trigonometry - Law of Sines vs Law of Cosines: Which One Do You Use?
Learn when to use Law of Sines vs Law of Cosines in triangles. Quick decision rule: matching angle-side pair means Sines, no match means Cosines.
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Trigonometry - The Law of Sines Explained
Learn the Law of Sines: how the ratio of sine of an angle to its opposite side stays constant in any triangle, with a practical example solving for an unknown side.
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Trigonometry - Finding an Angle with the Law of Sines
Learn how to find a missing angle using the Law of Sines, including how to check for the ambiguous case when two angle solutions are possible.
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Trigonometry - The Law of Cosines Explained
Learn how the Law of Cosines extends the Pythagorean theorem to work with any triangle, not just right triangles, and when to apply it.
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Trigonometry - Finding a Side with the Law of Cosines
Learn how to use the Law of Cosines to find the distance between two points when you know two sides and the included angle, with a step-by-step example.
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Trigonometry - Finding an Angle with the Law of Cosines
Learn how to find triangle angles using the Law of Cosines when all three sides are known. Includes step-by-step example with inverse cosine calculation.
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Trigonometry - Solving a Real-World Triangle Problem
Learn how to use the Law of Cosines to find the distance between two cell towers given two sides and an included angle (SAS). Includes step-by-step calculation and common mistakes.