Answer:
A definition
Explanation:
First, let's start by defining the four given terms:
1- A postulate: This is a naturally true statements. No proofs are needed.
2- A definition: This is what we use to describe or define something.
3- A conjecture: This is a statement that has not yet been proven as true.
4- A theorem: When a conjecture is proved to be true, it becomes a theorem.
For the given statement, we can note that we are describing a right angle or defining what a right angle is.
This means that the correct answer would be: definition
Hope this helps :)
