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# Pre-Algebra Ch. 9

TermDefinition
acute angle an angle with a measure greater that 0 degrees and less than 90
acute triangle a triangle that has three angles less that 90 degrees
congruent line segments that have the same length, or angles that have the same measure, or figures that have the same size and shape
converse the statement formed by reversing the phrases if and then in an if-then statement
Distance Formula the distance between two points with coordinates (x1, y) and (x2, y2)
Equilateral Triangle a triangle with all sides congruent
hypotenuse the side opposite the right angle in a right triangle
irrational numbers a number that cannot be expressed as a/b where a and be are integers and b does not equal zero (these numbers just don't make sense)
isosceles triangle a triangle that has at least two congruent sides
legs the sides that are adjacent to the right angle of a right triangle
line segment part of a line containing two endpoints and all the endpoints between them
obtuse triangle a triangle with one obtuse angle
obtuse triangle a triangle with one angle greater than 90 degrees
perfect square rational numbers whose square roots are whole numbers
Pythagorean Theorem the sides of a right triangle represented by a,b, and c, when a^2 + b^2 = c^2
radical sign the symbol used to indicate a nonnegative square root
real numbers the set of rational numbers together with the set of irrational numbers
scalene triangle a triangle with no congruent sides
similar figure figures that have the same shape but not necessarily the same size
solve a right triangle using the Pythagorean Theorem to find the length of the third side of a triangle, if the lengths of the other two sides are known
square root one of the two equal factors of a number
straight angle an angle with a measure equal to 180 degrees
triangle a figure having three sides
vertex the common endpoint of the rays forming an angle
Created by: Miss Brinkoetter