15 terms

# Geometry A Chapter 4 Vocabulary

Geometry Chapter 4 Vocabulary
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transformation
An operation that moves or changes a geometric figure in some way to produce a new figure
equilateral triangle
A triangle with three congruent sides
congruent
Figures where all parts of one figure are congruent to the corresponding parts of the other figure.
hypotenuse
The side opposite the right angle in a right triangle. It is the longest side.
reflection
A transformation that uses a line of reflection to create a mirror image of the original figure
rotation
A transformation that turns a figure about a fixed point called the center of rotation
scalene triangle
A triangle with no congruent sides.
acute triangle
A triangle with three acute angles
translation
A transformation that moves every point of a figure the same distance in the same direction
right triangle
A triangle with one right angle
vertex
The angle formed by the legs in an isosceles triangle
corollary
A statement that can be easily proven using a theorem
SSS
Postulate used to prove triangles are congruent if all 3 sets of corresponding sides are congruent.
SAS
Postulate used to prove triangles are congruent if 2 sets of corresponding sides and their included angles are congruent.
HL
Postulate used to prove right triangles are congruent if the hypotenuse and a leg of one right triangle are congruent to the corresponding parts of another right triangle