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# Formula Cheat Sheet: GED Math (page 2)

By LearningExpress Editors
LearningExpress, LLC
Updated on Apr 4, 2011

Below are mathematics formulas that you will need for the GED math.  For both sections on the GED math, a formula sheet will be provided to the test taker; however, you should be familiar and understand when and how to use the formulas prior to the test.

### Area

Square: A = side2

Rectangle: A = length × width

Parallelogram: A = base × height

Triangle: A = × base × height

Trapezoid: A = (base1 + base2) × height

Circle: A = π × radius2; π is approximately equal to 3.14.

### Circumference

Circle: C = π × diameter; π is approximately equal to 3.14.

### Distance between Points on a Coordinate Plane

Distance between points: ; (x1,y1) and (x2,y2) are two points on the line.

### Distance Formula

Distance = rate × time

### Measures of Central Tendency

Mean: (x1 + x2 +… + xnx1) ÷ n, where x's are values for which a mean is desired and n is the total number of values for x

Median: the middle value of an odd number of ordered scores, and halfway between the two middle values of an even number of ordered scores

### Perimeter

Square: P = 4 × side

Rectangle: P = 2 × length + 2 × width

Triangle: P = side1 + side2 + side3

### Pythagorean Theorem

a2 + b2 = c2; a and b are legs, and c is the hypotenuse of a right angle.

### Simple Interest Formula

Interest = principal × rate × time

### Slope of a Line on a Coordinate Plane

Slope of a line: (y2y1) ÷ (x2x1); (x1, y1) and (x2, y2) are two points on the line.

### Total Cost

Total cost = number of units × price per unit

### Volume

Cube: V = edge3

Rectangular solid: V = length × width × height

Square pyramid: V = × (base edge)2 × height

Cone: V = × π × radius2 × height; π is approximately equal to 3.14.

Cylinder: π × radius2 × height; π is approximately equal to 3.14V = B × h (the area of the base times the height).

Rectangular solid: V = l × w × h

Cylinder: V = π × r2 × h

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