http://www.ck12.org Chapter 8. Right Triangle Trigonometry
8.5 30-60-90 Right Triangles
Here you’ll learn that the sides of a 30-60-90 right triangle are in the ratiox:x
√
3 : 2x.What if you were given a 30-60-90 right triangle and the length of one of its side? How could you figure out the
lengths of its other sides? After completing this Concept, you’ll be able to use the 30-60-90 Theorem to solve
problems like this one.
Watch This
MEDIA
Click image to the left for more content.CK-12 Foundation: Chapter8306090RightTrianglesA
Watch the first half of this video.
MEDIA
Click image to the left for more content.James Sousa:Trigonometric Function Values of Special Angles
Now watch the first half of this video.
MEDIA
Click image to the left for more content.James Sousa:SolvingSpecialRight Triangles
Guidance
One of the special right triangles is called a 30-60-90 triangle, after its three angles. To construct a 30-60-90 triangle,
start with an equilateral triangle.