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Angles


Triangles

Finding the Measures of Angles in Right Triangles


SOH-CAH-TOA

Just remember the right righteous Chief SOH-CAH-TOA (pronounced SO-KAH-TOE-AHH) who lives in a right-triangle tepee. (Sorry about failing political correctness.)
SOH-CAH-TOA stands for
  • Sine = Opposite/Hypotenuse
  • Cosine = Adjacent/Hypotenuse
  • Tangent = Opposite/Adjacent


  • Contributed by:
    Mark Stanton
    High School Math Teacher
    New York City



    Circles


    Area and Circumference of a Circle


    Tweedle-dee-dum and Tweedle-dee-dee,
    Around the circle is pi times 3,
    But if the area is declared,
    Think of the formula pi "r" squared.

    "Around the circle" means circumference.
    Circumference = pi x 3
    Area = pi x r squared < BR>


    Contributed by
    Noelle Haney
    Seventh Grade Math Teacher
    Massachusetts


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