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# Geo Chapter 4&6 Voc

### Geometry

A triangle with no congruent sides Scalene Triangle
A triangle with at least two congruent sides Isosceles Triangle
A triangle with three congruent sides Equilateral Triangle
A triangle with three acute angles Acute Triangle
A triangle with one right angle Right Triangle
A triangle with one obtuse angle Obtuse Triangle
A triangle with three congruent angles Equilateral Triangle
The original, inside angles formed by a polygon Interior Angles
The angles that form linear pairs with the interior angles Exterior Angles
Adding a line, segment, or ray to a given diagram in order to complete a proof Auxiliary Lines
A statement that can be easily proven using the theorem Corollary to a Theorem
Two geometric figures that have exactly the same size and shape Congruent Figures
A pair of sides or angles that have the same relative position in two congruent or similar figures. Corresponding Parts
The sides adjacent to the right angle Leg of a Right Triangle
The side opposite the right angle Hypotenuse
Uses arrows to show the flow of a logical argument Flow Proof
Two congruent sides of an isosceles triangle Legs
The angle formed by the two legs of an isosceles triangle Vertex Angle
The third side of an isosceles triangle Base
The two angles adjacent to the base side Base Angles
An operation that moves or changes a geometric figure in some way to produce a new figure Transformation
The new figure by a transformation Image
A transformation that moves every point of a figure the same distance in the same direction Translation
A transformation that uses a line of reflection to create a mirror image of the original figure Reflection
A transformation that turns a figure about a fixed point Rotation
Changes the position of the figure without changing its size or shape Congruence Transformation
he line used to reflect an object Line of Reflection
The point that a figure is turned around when completing a rotation Center of Rotation
Rays drawn from the center of rotation to a point and its image Angle of Rotation
A comparison of two numbers using division Ratio
An equation that states two ratios are equal Proportion
The middle terms of a proportion Means
The first and last term of a proportion Extremes
A drawing that is the same shape as the object it represents Scale Drawing
A ratio that describes how the dimensions in a scale drawing are related to the actual dimensions of the object Scale
Two polygons such that their corresponding angles are congruent and the lengths of corresponding sides are proportional Similar Polygons
The ratio of the lengths of two corresponding sides of two similar polygons Scale Factor
A transformation that stretches or shrinks a figure to create a similar figure Dilation
The fixed point about which the figure is enlarged or reduced Center of Dilation
The ratio of a side length of the image to the corresponding side lengths of the original figure Scale Factor of a Dilation
A dilation with a scale factor between zero and one Reduction
A dilation with a scale factor greater than one Enlargement
Created by: warnockj