Lesson 1: TRIGONOMETRY

• Trigonometry


  A branch of mathematics that studies triangles and the relationships between the lengths and angles between them
• Trigonometry


  The word came from Greek words 'trigonon' meaning triangle and 'metron' meaning measure
• Right triangle


  • The relationship between the angles and the sides is expressed in trigonometric ratios
• Trigonometric ratios


  The ratios of the sides of a right triangle
• Trigonometric ratios


  • Sine
  • Cosine
  • Tangent
  • Cosecant
  • Secant
  • Cotangent
• Sine (SOH)


  Opposite side / Hypotenuse
• Cosine (CAH)


  Adjacent side / Hypotenuse
• Tangent (TOA)


  Opposite side / Adjacent side
• Cosecant


  Hypotenuse / Opposite side
• Secant


  Hypotenuse / Adjacent side
• Cotangent


  Adjacent side / Opposite side
• The hypotenuse is always the longest side and opposite the right angle
• The adjacent side is the side next to the angle
• The opposite side is the side opposite the angle