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Math Formulas for the HiSET-TASC-GED exam

These Math Formulas are part of our GED online prep, click here to read how it works.

 

AREA of a:

square Area = side2
rectangle Area = length × width
parallelogram Area = base × height
triangle Area = 1/2 × base × height
trapezoid Area = 1/2 × (base1 + base2) × height
circle Area = p × radius2; p is approximately equal to 3.14.

PERIMETER of a:

square Perimeter = 4 × side
rectangle Perimeter = 2 × length + 2 × width
triangle Perimeter = side1 + side2 + side3
CIRCUMFERENCE of a circle Circumference = p × diameter; p is approximately equal to 3.14.

VOLUME of a:

cube Volume = edge3
rectangular solid Volume = length × width × height
square pyramid Volume = 1/3 × (base edge)2 × height
cylinder Volume = p × radius2 × height; p is approximately equal to 3.14.
Cone Volume = 1/3 × p × radius2 × height; p is approximately equal to 3.14.

COORDINATE GEOMETRY distance between points = ; (x1, y1) and (x2, y2) are two points in a plane.slope of a line = ; (x1, y1) and (x2, y2) are two points on the line.

PYTHAGOREAN RELATIONSHIP a2 + b2 = c2; a and b are legs and c the hypotenuse of a right triangle.

MEASURES OF CENTRAL TENDENCY mean = , where the x‘s are the 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.

SIMPLE INTEREST interest = principal × rate × time
DISTANCE distance = rate × time
TOTAL COST total cost = (number of units) × (price per unit)