# Properties of Equality in Geometric Proofs

## What property or postulate is used to prove that if AB≅CD, then CD≅AB in a geometric proof?

Option 1: Reflexive Property of Congruence

Option 2: Addition Property of Equality

Option 3: Segment Addition Postulate

Option 4: Symmetric Property of Equality

Final answer: The Symmetric Property of Equality is used to prove that if AB≅CD, then CD≅AB in a geometric proof.

## Answer:

The Symmetric Property of Equality is used to prove that if AB≅CD, then CD≅AB in a geometric proof.

The Symmetric Property of Equality is a fundamental concept in geometry that helps in proving the equality of quantities in either order. When applying this property, if two quantities are equal, they can be written in reverse order without affecting their equality.

In the context of geometric proofs, if we have line segments AB and CD that are congruent (denoted by the symbol ≅), we can use the Symmetric Property of Equality to show that CD is also congruent to AB. This property allows us to interchange the order of the equal segments.

For example, if AB represents the length of a line segment and CD represents the length of another line segment, if AB is equal to CD, then CD is also equal to AB. This concept is essential in proving geometric theorems and properties.

Understanding and applying the Symmetric Property of Equality is crucial in geometric reasoning and proofs. It helps establish the relationships between geometric figures and properties, leading to accurate and valid conclusions.