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# What is a ray in math?

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In math, a ray is part of a line that has an endpoint at its starting point and extends in a certain direction into infinity. Drawing a ray involves placing a line with one endpoint and an arrow point on the other end. To name a ray, the convention is to use the letter at the starting point followed by a letter near the arrow point.

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One can use capital letters to name a ray, and over the two letters is drawn a ray symbol. An alternate convention used to name a ray is to use one lower case letter.

Two rays that diverge from a common starting point are called an angle. Another name for this starting point is the vertex of the angle.

## Related Questions

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Four squared in math is 16, as any number squared is multiplied by itself. Another way to express four squared is to say four to the second power.

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Exponential math is any mathematical operation involving an exponent, which is the number or symbol placed above and after another number or symbol to indicate the power to which the former number is to be raised, Wikipedia explains. The operation 4 x 4, for example, is written exponentially as 4^2.

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A cubed number in math is one that has been multiplied by itself three times. They are called cubed numbers because the height, width and depth of a cube are all the same. The cubes of whole numbers, or counting numbers, including zero, are called perfect cubes.