Mathematics > QUESTIONS & ANSWERS > ACT Math Formulas (Barrons)All the important and most forgotten formulas needed to know for the ACT (All)
ACT Math Formulas (Barrons)All the important and most forgotten formulas needed to know for the ACT
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Pythagorean theorem Correct Answer: a^2 + b^2 = c^2 Circumference of a circle Correct Answer: C= (3.14)(d) Area of a circle Correct Answer: A=(3.14)(r^2) distance formula Correct Answer: D=(r)(t) ... arithmetic sequence formula (explicit) Correct Answer: an = a1 + (n - 1)d Sum of arithmetic sequence Correct Answer: S = (n/2) (a1 +(a1+(n-1)d)) or S = (n/2) (a1 + an) Geometric sequence formula Correct Answer: an=a1(r)^n-1 Geometric Series formula Finite Correct Answer: Sn = a1 (1-r^n) / (1-r) Combination formula Correct Answer: nCr=n!/r!(n-r) Permutation Correct Answer: nPr=n!/(n-r)! parabola Correct Answer: y=a(x-h)^2+k circle Correct Answer: (x-h)^2+(y-k)^2 ellipse Correct Answer: ((x-h)^2/a^2) + ((y-k)^2/b^2)= 1 hyperbola Correct Answer: ((x-h)^2/a^2) - ((y-k)^2/b^2)= 1 Inscribed angle Correct Answer: IA=central angle(or intercepted arc)/2 [Show More]
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