# Geometry A Chapter 4 Vocabulary

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Geometry Chapter 4 Vocabulary

### 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

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