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18 Cards in this Set
- Front
- Back
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Formula for finding angle from arc length and radius
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θ =s/r
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Formula for finding arc length from angle and radius
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s=θr
convert angle to radians first) |
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formula for converting angles to radians
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angle degrees x π radians/180 degrees
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formula for converting radians to angles
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radians x 180 degrees/π radians
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2π = _____ degrees
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360
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π = _____ degrees
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180
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π/2 = _____ degrees
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90
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π/3 = _____ degrees
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60
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π/4 = _____ degrees
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45
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π/6 = _____ degrees
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30
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π/9 = _____ degrees
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20
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to convert minutes to degrees
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45 degrees 50' = 45 degrees + 50/60 =
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to convert seconds to degrees
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45 degrees 50' 36" = 45 degrees + 50/60 + 36/3600 =
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to convert from decimals to minutes
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12.456 degrees = 12 degrees + (.4 x 60) + (.056 x 3600)
Note that you may have to adjust seconds by converting some to minutes and adding to the minutes |
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mnemonic for sin, cos, tan
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SOHCAHTOA
Sin = Opposite/hypotenuse Cos = adjacent/hypotenuse tan = opposite/adjacent |
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csc
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inverse of sin (H/O)
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sec
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inverse of cos (H/A)
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cotan
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inverse of tan (A/O)
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