# Ch.4 Terms

### 23 terms by makayla0805

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### acute triangle

a triangle whose interior angles are all acute

### auxiliary line

line (or ray or segment) added to a diagram to help in a proof

### base angles

the angles whose vertices are the endpoints of the base of the triangle

### congruence transformation

Transformation that changes the position of the figure without changing its size or shape. Rotation, Translation or Reflection.

### congruent polygons

polygons with same size and shape

### coordinate proof

A proof involving placing geometric figures in a coordinate plane.

### corollary

(logic) an inference that follows directly from the proof of another proposition

### corresponding parts

Sides or angles that occupy the same relative positions in similar polygons.

### equiangular triangle

A triangle with 3 congruent angles

### equilateral triangle

a triangle with three congruent sides

### exterior angle

An angle formed by one side of a polygon and the extension of an adjacent side

### flow proof

a type of proof that uses arrows to show flow of a logical argument statements are connected by arrows to show how each statement comes before it. and each reason is written below the statement it justifies

### included angle

An angle created by two adjacent sides

### included side

the common side of two consecutive angles of a polygon

### isosceles triangle

a triangle with two equal sides

### obtuse triangle

a triangle that contains an obtuse interior angle

### reflection

A transformation that "flips" a figure over a mirror or reflection line.

### remote interior angles

the two nonadjacent interior angles corresponding to each exterior ange of a triangle

### right triangle

a triangle with one right angle

### rotation

(mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin

### scalene triangle

a triangle with no two sides of equal length

### translation

(mathematics) a transformation in which the origin of the coordinate system is moved to another position but the direction of each axis remains the same

### vertex angle

the angle in a triangle opposite the base

Example: