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Learn about the properties and applications of right triangles and trigonometry with Khan Academy's comprehensive unit.
Triangles are not always right (although they are never wrong), but when they are it opens up an exciting world of possibilities. Not only are right triangles cool in their own right (pun intended), they are the basis of very important ideas in analytic geometry (the distance between two points in space) and trigonometry.
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In a right triangle, the hypotenuse is the longest side, an "opposite" side is the one across from a given angle, and an "adjacent" side is next to a given angle.
A guide to right triangle trigonometry on the digital SAT 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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Sal is given a right triangle with an acute angle of 65° and a leg of 5 units, and he uses trigonometry to find the two missing sides.
Review the basics of triangle angles, and then try some practice problems. 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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