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Trigonometry - Coggle Diagram

- - - - sin 30 = 1/2
      - sin 60 = √3 / 2
      - sin 45 = 1/√2
  - - - cos 60 = 1/2
      - cos 45 = 1/√2
      - cos 30 = √3 / 2
  - - - tan 60 = √3
      - tan 45 = 1
      - tan 30 = 1/√3
  - - - Example:
- - - - In conclusion, if we are given the lengths of two sides of a triangle and their included angle, we can find the area of the triangle
  - - - Condition 1: Two sides and a non-included angle are given
      - Condition 2: The given angle is acute
      - Condition 3: The side opposite the given angle is shorter than the other given side
  - - - a =
    - - A =
- - - - Measured from the north or south to the east or west
    - - Measured from the north in a clockwise direction
      - Written as an angle in degrees to three figures
  - - - If a line AO, such that O is a point on the plane, is perpendicular to the plane, then AO is a normal to the plane
      - The distance from A to the plane is given by the length of AO
    - - If a line OB is not normal to the plane, it will be inclined at an acute angle to the plane.
      - The angle between OB and the plane is ∠OBC, where C is the foot of the normal BC
      - OC is known as the projection of the line OB on the plane