Consider the diagram shown below. Triangle ABC has been mapped to triangle A'B'C' using a single rigid motion. What type of rigid motion was done to complete this mapping? 
Definitions:
Neutrons
Subatomic particles present in the nucleus of an atom, carrying no electrical charge and having a mass slightly larger than that of protons.
Uranium
A heavy, silvery-white metallic element, radioactive and used as fuel in nuclear reactors and weapons.
Isotope
Variants of a particular chemical element which differ in neutron number but have the same number of protons.
Iron-56
An isotope of iron with a mass number of 56, known for its stability and abundant presence in the universe.
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