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Exam Study guide { Pre-algebra Vocabulary: 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. 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. Good Luck!!!