Trig

• $(sinx)/(cosx)=$$tanx$ Trigonometric identities
• $sin^2x +$$cos^2x =$$1$ Trigonometric identities
• sin30

  0.5
• sin45


  $\dfrac{\sqrt{2}}{2}.$
• sin60


  $\dfrac{\sqrt{3}}{2}$
• cos30 = √3/2
• cos45 = sin45
• cos60

  1/2
• tan30° = √3/3
• tan45

  1
• tan60


  $\sqrt{3}$
• arc length


  r theta
• area of a sector

  1/2* r(squared) theta
• Area of a triangle

  1/2*r(squared)sin theta
• 180 degrees


  pi radians