ACT MATH STUDY GUIDE | QUESTIONS & EXPERTLY VERIFIED ANSWERS | 2025 | 2026 – GRADED A+

ACT MATH STUDY GUIDE | QUESTIONS & EXPERTLY VERIFIED ANSWERS | 2025 | 2026 – GRADED A+ Quiz_________________? Area of circle - Answer pi x radius to the second power Quiz_________________? Area of parallelogram - Answer Base x height Quiz_________________? Area of rectangle - Answer Base x height Quiz_________________? Area of square - Answer side to the second power Quiz_________________? Area of triangle - Answer 1/2x base x height Quiz_________________? Circumference of circle - Answer 2 x pi x radius OR pi x diameter Quiz_________________? cos - Answer adjacent/hypotenuse Quiz_________________? Degrees in circle - Answer 360 Quiz_________________? Degrees in triangle - Answer 180 Quiz_________________? Distance Formula [between 2 points (x1, y1) and (x2, y2)] - Answer Square root (x2 - x1) to the second power + (y2 - y1) to the second power Quiz_________________? Equation of circle: Case 1: If center is (0,0): - Answer x2 + y2 = r2 Quiz_________________? Equation of circle: Case 2: If center is (h,k): - Answer (x-h)2 + (y-k)2 = r2 Quiz_________________? FOIL - Answer First, outside, inside, last (EX: (X-3)(X+2) = x2 + 2x -3x - 6) Quiz_________________? Logarithm Formula: log base x = y - Answer b to the y power equals x Quiz_________________? Mean - Answer Add all numbers, divide by number of numbers. Quiz_________________? Median - Answer The middle number from small to large, choose median. Quiz_________________? Midpoint Formula [between 2 points (x1, y1) and (x2, y2)] - Answer (x1 + x2/2, y1 + y2/2) Quiz_________________? Number of degrees in n-sided polygon - Answer (n-2)(180) Quiz_________________? Percent Formula - Answer is/of = %/100 Quiz_________________? Point slope form of a line: - Answer y - y1 = m (x - x1)