Math Help: Formulas You Can't Ignore

10/09/2015

Math Formulas to Keep in Mind

As you advance in your math studies, you will frequently come across situations where you will need to know these formulas. Keep them in mind.

Circle Proportionality

When asked what part of a circle a piece represents, remember these formulas: Slice/Area=Arc/Circumference=Measure of angle/360.

Line Formulas

Know the standard, point-slope line formula (y=mx+b) and the equation for slope (y2-y1)/(x2-x1).

Midpoint Formula When you need to find the midpoint of a line, use this formula to determine the coordinates.

Rectangle Formulas

Area=lw l is the length and w is the width. Multiply them together to find the area of a rectangle. Perimeter=2l+2w Double the length of each side and add the results together to calculate the perimeter. Volume=lwh h is the height of the rectangle. Multiply length, width, and height to find the volume.

Find Percentages

To find x percent of a number (n), To find what percent a number (n) is of another number (m), Find Probability The probability (P) of an event occurring is measured as a fraction (between 0 and 1) with 1 being 100% probability and 0 being 0%. Take the number of desired outcomes and divide by the number of possible outcomes. For example, if you want to know the probability of rolling a 3 on a six-sided di, it is 1 (because there is only one 3) over 6 (because there are 6 possibilities). To find the probability two, mutually exclusive events both occurring, multiply their probabilities. If you want to know the probability of rolling a 3 and then a 4, you would multiply 1/6*1/6 for 1/36.

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