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Handout

Purplemath: Special Angle Values: 30 60 90 and 45 45 90 Triangles

Curated by ACT

Explains a simple pictorial way to remember basic reference angle values. Provides other memory aids for the values of trigonometric ratios for these "special" angle values, based on 30-60-90 triangles and 45-45-90 triangles.

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Concepts
cosine, sine, tangent, trigonometric ratios
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Additional Tags
reference, trig, purplemath, purplemath: special angle values: 30-60-90 and 45-45-90 triangles, right triangle, angle, degree, triangle, trigonometry, basic review of trigonometry
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Classroom Considerations
  • Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)
  • The intended use for this resource is Instructional