ACT Math For Dummies
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Some of the questions on the ACT Math test deal with trigonometry problems. Below are some of the most useful formulas for trig ratios, radians, and identities.

  • Six trig ratios:

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  • Formula for radians:

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  • Five trig identities:

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Mark Zegarelli is the author of Basic Math & Pre-Algebra For Dummies, SAT Math For Dummies (both from Wiley), and five other books on basic math, calculus, and logic. He holds degrees in both English and math from Rutgers University and is a math tutor and teacher.

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