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Why is this concept useful?: A ray shows a line going in one direction for infinity and is a way of understanding the direction of the line.
Where does this concept fit into the curriculum?: Middle and High School Geometry

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What is a ray in geometry?

A ray is part of a line that has a fixed starting point but no end point, as it extends in one direction for infinity.

How to use a ray in geometry problems?

Sample Math Problems

Question

A ray is different from a line in that

A line has a beginning and a ray does not
A ray can cross itself
A line can be curved but a ray is always straight
One side of the ray goes on forever while the other stops

Solution

Answer: D

Question

True or False: You can measure the length of a ray

True
False

Solution

Answer: B – False. You cannot measure the length of a ray.

Question

What are the rays that make up angle ABC?

Solution

Answer: BA→ , BC→

Question

Solution

What are the rays that make up angle LMN?

Answer: ML→ ,MN→

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Practice Math Problems

1. How does a ray differ from a line segment?

2. Which of these real world examples is a representation of a ray

A pencil
A piece of string
A car’s route from work to home
Light from the sun

3. If we add two rays together, what is the resulting length

1000000 miles
20 inches
45 feet
We cannot place a value on the rays’ resulting length

4.

Based on the diagram above, what are the rays that make up angle MNL?

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Geometry Worksheets

What is a ray in geometry?

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Normal Distribution

Tossing a Coin

Properties of Exponents

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Sample Math Problems

Download FREE Math Resources

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Practice Math Problems