Special right triangles review (article) | Khan Academy
Learn shortcut ratios for the side lengths of two common right triangles: 45°-45°-90° and 30°-60°-90° triangles. The ratios come straight from the Pythagorean theorem.
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Learn how to prove the ratios between the sides of a 30-60-90 triangle. Skip to main content If you're seeing this message, it means we're having trouble loading external resources on our website.
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You probably like triangles. You think they are useful. They show up a lot. What you'll see in this topic is that they are far more magical and mystical than you ever imagined!
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The video explores how triangles are classified based on their sides and angles. It introduces the terms scalene, isosceles, and equilateral for side lengths, and acute, right, and obtuse for angles. It emphasizes that triangles can be categorized in multiple ways based on these characteristics.
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Learn how to find trigonometric ratios in right triangles with Khan Academy's comprehensive guide.
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Our mission is to provide a free, world-class education to anyone, anywhere. Khan Academy is a 501 (c) (3) nonprofit organization. Donate or volunteer today! About. News.
Special right triangles intro (part 2) (video) | Khan Academy
A 30-60-90 triangle is a special right triangle with angles of 30, 60, and 90 degrees. It has properties similar to the 45-45-90 triangle. The side opposite the 30-degree angle is half the length of the hypotenuse, and the side opposite the 60-degree angle is the length of the short leg times the square root of three.
Intro to 30-60-90 Triangles | Khan Academy
A few more 45-45-90 examples and an introduction to 30-60-90 triangles.