## Intro to SOHCAHTOA

Summary
The lesson provides a foundational understanding of trigonometry, focusing on the concept of similar triangles and the introduction of SOHCAHTOA for calculating the ratios of sides in right-angled triangles.
• Trigonometry is fundamentally based on the properties of similar triangles, where two triangles are considered similar if they share two equal angles, leading to proportional sides.
• SOHCAHTOA is a mnemonic that helps remember the three primary trigonometric ratios: sine (opposite over hypotenuse), cosine (adjacent over hypotenuse), and tangent (opposite over adjacent).
• These ratios remain constant for any given angle across all similar right-angled triangles, allowing for the calculation of unknown sides given one side and one acute angle.
• The lesson emphasizes the practical application of these concepts through examples and practice problems, demonstrating how to use trigonometric ratios and the Pythagorean theorem to solve for unknowns in triangles.
• It also introduces the Pythagorean Identity (cosine squared theta plus sine squared theta equals 1) as an important trigonometric formula.
Chapters
00:04
Introduction to Similar Triangles
02:11
Understanding SOHCAHTOA
03:36
Applying Trigonometry to Solve Problems
08:49
The Pythagorean Identity