100 km radius

USAGE SUMMARY

The phrase "100 km radius" is correct and usable in written English.
It can be used to describe a circular area with a radius of 100 kilometers, often in contexts such as geography, planning, or logistics. Example: "The wildlife reserve is protected within a 100 km radius to ensure the safety of the animals."

✓ Grammatically correct

Science

Wiki

News & Media

Human-verified examples from authoritative sources

Exact Expressions

21 human-written examples

Along the bottom we prescribe TM=1,335 °C except for a half-circular plume inflow region with 100 km radius, where we define a Gaussian-shaped temperature anomaly and a parabolic inflow profile.

Nature

Fig. 2 Field photo showing basalt flow layers Fig. 3 Spatial distribution of elevation in and around Koyna region (100 Km radius).

Geoenvironmental Disasters

The relations are strictly valid for annular dynamos, so I assume a small inner core of 100 km radius and a well-mixed liquid region extending to 1100 km radius.

Progress in Earth and Planetary Science

Examination of 2,596 forecasts generated between 2013-07-01 and 2013-11-30 found 1,192 (45.9%) matched exactly the date and within a 100 km radius of a civil unrest event reported in traditional news media.

Security Informatics

The 100 km radius of the buffer zone nearest to Soviet territory had the additional designation of prohibited airspace.

Wikipedia

The city has a population of approximately 760,000 whereas about 8 million people live within a 100 km radius of its main square.

Wikipedia

Human-verified similar examples from authoritative sources

Similar Expressions

39 human-written examples

Seven rainforest sampling sites were chosen within a 10 km radius of XTBG.

Nature

Historical soil contamination within a 3 km radius of a former ore treatment plant was evaluated.

Journal of Geochemical Exploration

Landscape composition was characterized at 11 spatial scales from 95 m to 3 km radius.

Biological Control

Abundance of Dolichopodidae increased with the proportion of seminatural habitats in 1 km radius.

Agriculture, Ecosystems & Environment

The biggest impact to the measurement originates generally within 1 km radius from the tower.

Agricultural and Forest Meteorology

Expert writing Tips

Best practice

When using "100 km radius", ensure the context clearly defines the center point from which the radius is measured for clarity.

Common error

Avoid mixing units (e.g., "100 km radius miles") as it leads to confusion. Stick to a consistent unit of measurement.

Linguistic Context

The phrase "100 km radius" functions as a measurement, typically used as an adjectival modifier to describe the spatial extent of something, such as a zone, area, or region. As evidenced by Ludwig, the phrase is grammatically correct.

Expression frequency: Common

Frequent in

Science

65%

Wiki

15%

News & Media

10%

Less common in

Formal & Business

5%

Encyclopedias

0%

Reference

0%

Ludwig's WRAP-UP

The phrase "100 km radius" is a commonly used and grammatically sound way to define a circular area with a specific spatial extent. As Ludwig AI confirms, this phrase is correct and finds frequent application across diverse domains, notably science, news, and general information. When using this term, it is useful to indicate clearly what the central point is from which the radius is measured. Alternatives such as "radius of 100 kilometers" or "100 kilometer radius" can provide variety while maintaining clarity. Ensuring consistency in units of measurement and clearly defining the center of the circle helps to avoid confusion and ensures the information is accurately understood.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

100 kilometer radius

Replaces the abbreviation "km" with the full word "kilometer".

radius of 100 kilometers

Changes the word order to emphasize "radius" as the primary term.

a circular area with a 100 km radius

Specifies that the phrase refers to a circular area.

100 km in all directions

Focuses on the extent of the area in all directions.

a 100 km zone

Uses "zone" to describe the area.

within a 100 km range

Replaces "radius" with "range".

over a distance of 100 km

Emphasizes the distance.

spanning 100 kilometers radially

Uses "spanning" and "radially" to describe the extent.

100 km distant

Focuses on the distance of 100 km.

extending 100 km outwards

Highlights the outward extension of the distance.

FAQs

How do I use "100 km radius" in a sentence?

You can use "100 km radius" to describe the extent of an area, such as "The exclusion zone has a "100 km radius" around the power plant."

What can I say instead of "100 km radius"?

You can use alternatives like "100 kilometer radius", "radius of 100 kilometers", or "100 km zone" depending on the context.

Which is correct, "100 km radius" or "radius of 100 km"?

Both ""100 km radius"" and "radius of 100 km" are correct. The choice depends on the desired emphasis and flow of the sentence.

What's the difference between "100 km radius" and "100 km diameter"?

The ""100 km radius"" refers to the distance from the center of a circle to its edge, while the "100 km diameter" is the distance across the circle through its center. The diameter is twice the radius.