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# What is a ray in geometry?

In geometry, a ray is a straight line extending infinitely from a fixed point. A ray is expressed using an arrow as its symbol (--->). A ray cannot be measured since it does not have an end on one side.

Continue ReadingA ray is part of a line, which goes on infinitely in both directions and is indicated with the symbol <--->. Like a ray, a line cannot be measured. A line segment, however, can be measured because it is part of a line with both a beginning and an ending point. When two rays share the same fixed point, an angle is formed, and that common point is known as the vertex.

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## What is the directrix of a parabola?

A: The directrix of a parabola refers to a straight line that is drawn perpendicular to the axis of symmetry of a parabola. This line does not touch the parab... Full Answer >Filed Under: -
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## What does the "distance between two points" mean?

A: In math, the term "distance between two points" refers to the length of a straight line drawn between the two points on an x-y axis. The distance can be de... Full Answer >Filed Under: -
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## What angle is zero degrees?

A: A zero degree angle appears as a straight line that travels from the point of inception to the right or positive side of a number line. If the line travels... Full Answer >Filed Under: -
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## Who are some mathematicians who studied geometry and what are their contributions?

A: Numerous mathematicians have studied geometry and made major contributions throughout history. Ancient geometers of importance include Pythagoras, Euclid, ... Full Answer >Filed Under: