Reflexive Property

Which of the following is equal to 4 + 5?

Did you answer too quickly? Look again. Notice that 4 + 5 is one of the answers given. Since that is exactly the same as the expression in the question, 4 + 5 must be the right answer. (Also, 3 + 7 = 10 and 4 + 5 = 9, so the other two answers cannot be correct.) Maybe you thought it was a trick question, but don't worry. What you are learning here is very simple.

Exactly! Did that seem too easy? Or did you think it was a trick question? Don't worry!

One of the places you will use the reflexive property is in geometry. In geometry, it is sometimes necessary to use the fact that an angle or line segment is equal to itself. Remember: [[summary]]

4 + 5 = 4 + 5 is an example of the *reflexive property*. The reflexive property is really that simple. In general, it says that *a = a*. Basically, the reflexive property is saying that something is equal to itself. This may seem silly to point out, but it is defining what the equals sign means. Math is built on rules and the definition of equality is one of the most fundamental.

8

4 + 5

3 + 7

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