radius

## IPA:

# Dictionary definition of **radius**

The distance from the center of a circle or sphere to any point on its circumference or surface.

"The geologist analyzed the **radius** of the impact crater to assess its size and force."

## Detailed meaning of **radius**

It represents a straight line segment that connects the center of the circular shape or sphere to its outer edge or boundary. The **radius** is half the length of the diameter, making it one of the fundamental measurements in geometry. It plays a crucial role in determining the size, proportions, and characteristics of circular objects. The **radius** helps define the extent and reach of a circle, providing important information about its dimensions, such as circumference, area, or volume. Beyond circles, the term can also apply to other spherical or curved objects, such as spheres or cylinders, where it represents the distance from the center to the surface. Understanding the **radius** is essential for analyzing and comprehending the properties, relationships, and calculations associated with circular or symmetrical objects in various fields, including mathematics, physics, and engineering.

## Example sentences containing **radius**

1. The carpenter measured the **radius** of the table leg before shaping it.

2. The **radius** of the planet determined its gravitational pull.

3. The cyclist carefully adjusted the **radius** of the bike's wheels for optimal performance.

4. The botanist studied the **radius** of tree rings to estimate the tree's age.

5. The architect calculated the **radius** of the arch to ensure structural stability.

6. The engineer determined the **radius** of the pipeline for efficient fluid flow.

## History and etymology of **radius**

The noun '**radius**' can be traced back to Latin origins. It is derived from the Latin word '**radius**,' which had multiple meanings, including a rod, spoke of a wheel, or a ray. In the context of geometry, the term '**radius**' was used to refer to the spoke of a wheel, and it eventually came to represent the distance from the center of a circle or sphere to any point on its circumference or surface. This shift in meaning from a physical object like a spoke to a geometric concept reflects the evolution of language and how words adapt to describe abstract ideas. Etymologically, '**radius**' embodies the idea of a spoke extending from a central point and, by extension, the distance from the center to the outer boundary of a circular or spherical object, as it is understood in geometry today.

## Further usage examples of **radius**

1. The mathematician used the **radius** to calculate the area of the circle.

2. The surgeon measured the **radius** of the patient's bone to select the appropriate implant.

3. The astronomer estimated the **radius** of the star based on its brightness and temperature.

4. The artist used a compass to draw circles of different radii on the canvas.

5. The mechanic checked the **radius** of the car's tire to ensure it was within the recommended range.

6. The **radius** of the circle is half of its diameter.

7. The Earth's average **radius** is about 6,371 kilometers.

8. She measured the **radius** of the sphere with precision.

9. The **radius** of the hurricane expanded rapidly.

10. Calculate the **radius** to find the circle's area.

11. The **radius** of a circle can be used to find its circumference.

12. The car's turning **radius** was surprisingly tight.

13. Astronomers study celestial bodies' radii to understand their size.

14. Engineers measured the bridge's arch **radius** carefully.

15. The planet's orbit has a variable **radius**.

16. The **radius** of a bubble determines its size.

17. The **radius** of a cylinder can be calculated from its volume.

18. He sketched a circle with a large **radius**.

19. The **radius** of the well was deeper than expected.

20. The sphere's **radius** affects its volume.

21. Calculate the **radius** of the cone to find its slant height.

22. The **radius** of a crater can reveal its age.

23. The circle's **radius** dictates its circumference.

24. The **radius** of the curvature made the road challenging.

25. He estimated the **radius** of the pizza to share it equally.

## Synonyms

## Quiz categories containing **radius**

https://static.wixstatic.com/media/eb68db_7eca51f0c20b45c3a25e6ebbf598afe2~mv2.jpg, https://static.wixstatic.com/media/eb68db_3d0b76aa2c5f4988a3b79c60fd01ccd3~mv2.jpg, https://static.wixstatic.com/media/eb68db_40c865c61aa9408586f9ed02ce3d005f~mv2.jpg

ACT 11 (American College Testing), High School 19, Shape and Form

expanse,extent,interval

semidiameter, entirety, whole, totality

eb68db_895f0fe0ee794c7983a10833fedcd8d6.mp3

distance,length,measurement,reach,scope,size,span