Whether you are preparing for a test or exam, or just to do your homework; you should always remember and know how to apply the following 25 important mathematics formulas that all high school students should know. We put them here in a simple list for you for easy reference. You may want to print this and attach it to your math workbook:

**Pythagorean Theorem**: a² + b² = c², used to find the missing side of a right triangle.**Quadratic Formula**: x = (-b ± sqrt(b² – 4ac))/2a, used to find the roots of a quadratic equation.**Distance Formula**: d = sqrt((x2 – x1)² + (y2 – y1)²), used to find the distance between two points in a coordinate plane.**Slope Formula**: m = (y2 – y1)/(x2 – x1), used to find the slope of a line.**Midpoint Formula**: ((x1 + x2)/2, (y1 + y2)/2), used to find the midpoint of a line segment.**Area of a Circle**: A = πr², used to find the area of a circle.**Circumference of a Circle**: C = 2πr or C = πd, used to find the circumference of a circle.**Volume of a Cylinder**: V = πr²h, used to find the volume of a cylinder.**Volume of a Sphere**: V = (4/3)πr³, used to find the volume of a sphere.**Surface Area of a Sphere**: A = 4πr², used to find the surface area of a sphere.**Exponential Growth/Decay Formula**: A = P(1 + r/n)^nt or A = P(1 – r/n)^nt, used to find the amount of money in an account or the population of a species after a certain amount of time.**Simple Interest Formula**: I = Prt, used to find the amount of interest earned on a principal amount.**Compound Interest Formula**: A = P(1 + r/n)^nt, used to find the amount of money in an account after a certain amount of time.**Perimeter of a Rectangle**: P = 2l + 2w, used to find the perimeter of a rectangle.**Area of a Rectangle**: A = lw, used to find the area of a rectangle.**Volume of a Rectangular Prism**: V = lwh, used to find the volume of a rectangular prism.**Slope-Intercept Form**: y = mx + b, used to find the equation of a line given the slope and y-intercept.**Point-Slope Form**: y – y1 = m(x – x1), used to find the equation of a line given the slope and a point.**Mean**: average of a set of numbers, calculated by adding all the numbers together and dividing by the total number of numbers.**Median**: the middle number in a set of ordered numbers.**Mode**: the number that appears most frequently in a set of numbers.**Standard Deviation**: a measure of how spread out a set of numbers is from the mean.**Probability**: the likelihood of an event occurring, calculated by dividing the number of favorable outcomes by the total number of possible outcomes.**Binomial Distribution**: a probability distribution used to calculate the probability of a certain number of successes in a fixed number of trials.**Trigonometric Functions**: sine, cosine, and tangent, used to find the ratios of sides in a right triangle.

These formulas can be used to solve a variety of problems in algebra, geometry, and statistics. High school students should be familiar with these formulas and know how to apply them to different types of problems.