irrational numbers
numbers that cannot be expressed in the form a/b, where a and b are integers and b =0.
rational number
any number that can be written as a fraction
angle of elevation
the angle formed by a horizontal line and the line of sight to an object above the horizontal line
angle of depression
The angle formed by a horizontal line and the line of sight to an object below the horizontal line
decimal point
A period separating the ones and the tenths in a decimal number.
significant figures
a prescribed decimal place that determines the amount of rounding off to be done based on the precision of the measurement
Index laws
laws (rules) that explain how to simplify exponent
scientific notation
A method of writing or displaying numbers in terms of a decimal number between 1 and 10 multiplied by a power of 10.
trigonometric ratio
a ratio of the lengths of sides of a right triangle