High School · Similarity, Right Triangles, and Trigonometry

CCSS.MATH.CONTENT.HSG.SRT.C.8

Use trigonometric ratios and the Pythagorean Theorem to solve right triangles in applied problems.

Read this standard on the official Common Core site

Lessons that teach this standard

• Solving Right Triangles: Inverse Trig and Angles of Elevation

  How to find a missing angle with inverse sine, cosine and tangent, when the Pythagorean theorem is faster, and how to set up an elevation or depression problem.

• Special Right Triangles: 45-45-90 and 30-60-90

  Where the side ratios of the two special right triangles come from, how to use them without a calculator, and the exact sine, cosine and tangent values they give.