# Exam Study guide - Riverdale Middle School ```Exam Study guide
{
Pre-algebra
Vocabulary:
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Congruent: means the same
Corresponding angles: A pair of angles that lie on the same
side of the transversal and are in corresponding positions.
Dilation: The increase or decrease in the size of a figure.
Hypotenuse: The side opposite of the right angle in a right
triangle.
Integers: Whole numbers and their opposites.
Interior Angles: angles on the inside of two lines cut by a
transversal.
Irrational Numbers: Any real number that cannot be
written as a fraction; it is infinite and non-repeating.
Legs: two sides that form the right angle in a right triangle.
Like terms: terms with the same variable.
Numerator: the top of a fraction
Perfect Square: its value is an integer and it’s a rational
number.
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Proportion: An equation that states that two ratios are
equivalent.
Radical: symbol used to represent square roots.
Rational numbers: any real number that can be written as a
fraction.
Real numbers: both rational and irrational numbers
Reciprocal: when you flip the numerator and the denominator.
Reflection: a transformation that flips a figure over a line of
reflection.
Rotation: a transformation that turns a figure about a point.
Scale factor: the amount that you are increasing or decreasing a
figure by.
Scientific notation: a way to abbreviate very large or very small
numbers using powers of ten.
Sphere: a 3-d figure with all points the same distance from the
center.
Supplementary: two angles whose measures have a sum of 180
degrees.
Translation: a transformation that slides a figure on a coordinate
plane.
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Good Luck!!!
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