A triangle with all angles congruent

(a)  

A triangle with an obtuse angle

(a)  

A triangle with all sides congruent

(a)  

A triangle with a right angle

(a)  

A triangle with at least two sides congruent

(a)  

A triangle with no two sides congruent (all different sides)

(a)  

An extra line or segment drawn in a figure to help complete a proof

(a)  

An angle formed by one side of a triangle and the extension of another side

(a)  

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

(a)  

A proof that organizes statements in logical order, starting with the given statements. Each statement is written in a box with the reason verifying the statements written below the box. Arrows are used to indicate the order of statements.

(a)  

A statement that can be easily proved using a theorem is called a (a)   of a theorem

Polygons in which all matching parts are congruent

(a)  

Matching parts of congruent polygons

(a)  

In a triangle, the angle formed by two sides is the ________ _____ for those two sides

(a)  

The side of a polygon that is the side of each of two angles

(a)  

The 2 congruent sides of an isosceles triangle

(a)  

The angle formed by the two legs of the isosceles triangle

(a)  

The angles opposite the legs of the isosceles triangle

(a)  

Proofs that use figures in the coordinate plane and algebra to prove geometric concepts

(a)