The Tutoring Center, Troy MI


Tutoring in Troy Michigan


Math Help: Helpful Math Formulas

Having these formulas ready in mind will help as you advance through your math career.


Remember that the average is the same as the mean. To find the average of a set of numbers, divide the sum of all the numbers in the set by the amount of numbers in the set.


To find x percent of a number (n), To find what percent a number (n) is of another number (m), And finally, n is x percentage of what number?

Circle Formulas

The area of a circle is the square of the radius times π. Multiply π times the diameter, or twice the radius, of a circle. When working with arcs, just remember that an arc is a percentage of a circle. Since there are 360 degrees in a circle, first calculate the percentage of the whole circle the arc represents. If the arc is 90 degrees, it is 90/360=1/4 or 25%. Multiply the area or circumference of the whole circle by this percentage to find the area or circumference of the arc.

Cylinder Volume

The volume of a cylinder is the area of the circle that makes up its end times the height of the cylinder.

Pythagorean Theorem

For any right triangle, the length of the hypotenuse (c) squared is equal to the sum of the squares of the two shorter sides (a and b).

For Tutoring in Troy, MI

Get more math help from The Tutoring Center in Troy, MI. We offer one-to-one tutoring in math, reading, writing, and test prep to students of all levels and ages. Find out more from our webpage and call 248-509-7177 to schedule your free diagnostic assessment today.


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