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Intro to the trigonometric ratios (video) | Khan Academy

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Sal introduces sine, cosine, and tangent, and gives an example of finding them for a given right triangle.

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Students: When using right triangle trigonometry and/or the Pythagorean Theorem to solve right triangles, you can use this resource to check results of your work afterwards.Directions: For any problem of this type, 1) Solve it completely first. 2) Then, use the slider (upper right) to select the appropriate right triangle context of the original problem. 3) Use the sliders and/or input boxes to enter appropriate values to recreate the triangle you solved. 4) Check theShow Other Measures box (upper left) to check results of your work.Note: For a side length, you can only enter values ranging from 0.01 to 10. To enter values > 10, simply scale down (ex: Enter 3.4 for a side length measuring 34 units long).

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Right Triangle Solver: Formative Assessment

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Students: When using right triangle trigonometry and/or the Pythagorean Theorem to solve right triangles, you can use this resource to check results of your work afterwards.Directions: For any problem of this type, 1) Solve it completely first. 2) Then, use the slider (upper right) to select the appropriate right triangle context of the original problem.

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Key Question: Hopefully, you noticed that when you keep the blue angle fixed and move only the white vertices, the value of each ratio never changes (even though the side lengths do)!Why does this occur? Explain!

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Key Question: Hopefully, you noticed that when you keep the blue angle fixed and move only the white vertices, the value of each ratio never changes (even though the side lengths do)!Why does this occur? Explain!

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Bepaald lengte van de ontbrekende zijde via sinus, cosinus of tangens. Paar keer doen, want alle drie de opties zitten in de applet.