Review of Angles

Acute Angle – Angle less than 90 degrees Right Angle – Angle that is exactly 90 degrees

Obtuse Angle – Angle more than 90 degrees but less than 180 degrees Straight Angle – Angle that is exactly 180

Degree to Radian Conversion Convert from degrees to radians by multiplying the number of degrees by Pi/180. Formula: Radians = # of Degrees x (Pi/180) Examples: 90 degrees = 90 x (Pi/180) = Pi/2 radians 270 degrees = 270 x (Pi/180) = (3Pi)/2 radians

Radian to Degree Conversion Convert from radians to degrees by multiplying the number of radians by 180/Pi. Formula: Degrees = # of Radians x (180/Pi) Examples: Pi radians = Pi x (180/Pi) = 180 degrees 2Pi radians = 2Pi x (180/Pi) = 360 degrees

Sine Curve

Cosine Curve

Right Triangle

Right Triangle Broken Down

Sine Formula Sin(x) = Opposite (O) Hypotenuse (H)

Cosine Formula Cos(x) = Adjacent (A) Hypotenuse (H)