Pre-Algebra Chapter 5 Vocabulary

A polygon that is equilateral and equiangular

The four outer angles formed by two lines cut by a transversal

Measure of two angles that add up to 90 degrees

Two angles formed by intersecting lines and are across the vertex from each other

In a right triangle, the square of the length of hypotenuse = the sum of the square of the legs

The two sides of a right triangle that form the right angle

A line that intersects two or more other lines

Same size, same measure

The angles of a triangle that are not adjacent to a given exterior angle

Lines in the same plane that never intersect or cross

A simple closed figure formed by three or more line segments

A formal proof that contains statements (steps) and reasons organized in two columns.

The side opposite the right angle in a right triangle

Measure of two angles that add up to 180 degrees

Interior angles that lie on opposite sides of the transversal

Two lines that intersect to form right angles

A paragraph proof

Exterior angles that lie on opposite sides of the transversal

The distance between two points with coordinates (x1,y1) and (x2,y2) is given by a formula

Formed when the parts of the theorem are reversed

Angles that are in the same position on two parallel lines in relation to a transversal

The four inside angles formed by two lines cut by a transversal

Reasoning using a # of specific examples to arrive at a prediction but lack logical certainty

A statement or conjecture that can be proven

A two column proof containing statements and reasons

A paragraph that explains why a statement or conjuncture is true

Reasoning that uses facts, rules, definitions, or properties to reach a logical conclusion

A polygon in which all angles are congruent

Logical argument in which each statement made is supported by a statement that is accepted true

A figure formed by three line segments that intersect only at the endpoints