radius
gb/ɹˈeɪdiəs/ us/ɹˈeɪdiəs/
B1
English
~ 6800
körzet, sugár, orsócsont
NOUN
B1
1
körzet
B1
Usage pattern:
within a [number]-[unit] radius of [a place]
All schools within a two-mile radius of the factory were closed as a safety precaution.
A gyártól számított két mérföldes körzetben minden iskolát biztonsági óvintézkedésként bezártak.
The restaurant delivers to customers living in a five-kilometer radius of the city center.
Az étterem a városközpont öt kilométeres körzetében lakó vendégeknek szállít ki.
Property prices within a small radius of the station have risen sharply.
They searched the forest in a one-mile radius around the campsite.
Noise complaints mostly come from residents living within a short radius of the airport.
Learner examples
There are three banks in a one-kilometer radius of my house.
A házam egy kilométeres körzetében három bank van.
We looked for a hotel within a small radius of the train station.
A vasútállomás kis körzetében kerestünk szállodát.
The store offers free delivery within a five-mile radius.
Many cafes are in a short radius around the office.
Police checked every car in a wide radius around the border.
Common mistake:
Learners sometimes think 'radius' in this sense must always describe a perfect circle, but in everyday speech it often just means the general surrounding area within a certain distance. They may also confuse 'within a 5-mile radius' with 'within 5 miles in one direction', forgetting that it means in any direction from the center point.
Meaning
area around a central point
Collocations
within a 10-mile radius
|in the immediate radius
|a 5-kilometer radius
|search radius
|expanded radius
Synonyms
vicinity (Emphasizes the nearby area in general, not specifically a distance-based circle.)
|
surrounding area (More general and less technical; does not imply a precise distance.)
Themes
space
|travel
|everyday_life
|science
|core_vocabulary
Definition
The round area around a place, up to a certain distance from the center.
A roughly circular area around a central point, defined by the maximum distance from that point.
NOUN
B2
TECHNICAL
2
sugár
B1
Usage pattern:
the radius of [a circle/object]
If the diameter of the circle is 10 centimeters, its radius is 5 centimeters.
Ha a kör átmérője 10 centiméter, akkor a sugara 5 centiméter.
The planet has an average radius of about 6,371 kilometers.
A bolygó átlagos sugara körülbelül 6 371 kilométer.
The formula for the area of a circle is pi times the radius squared.
Engineers adjusted the radius of curvature of the road to make it safer.
You can find the radius by dividing the circumference by two pi.
Learner examples
The radius of this circle is four centimeters.
Ennek a körnek a sugara négy centiméter.
We use the radius to find the area of a circle.
A kör területének kiszámításához a sugarat használjuk.
He drew a circle with a radius of 3 centimeters.
The sphere has a radius of one meter.
First, measure the radius, then do the calculation.
Common mistake:
Learners often confuse 'radius' and 'diameter', sometimes saying 'the radius is 10 cm' when 10 cm is actually the diameter. Remember that the radius is always half the diameter. Another mistake is using 'radius' when they mean the full circular area; in that case, 'area' or 'circle' is more accurate.
Meaning
distance from center to edge
Collocations
the radius of the circle
|calculate the radius
|radius of a sphere
|radius of curvature
|average radius
|radius and diameter
Synonyms
half-diameter (Informal mathematical description; explains size relation but is not used as a standard term in formulas.)
Themes
math
|science
|space
|education
Definition
In math, the straight line or distance from the center of a circle to its edge.
In geometry and related sciences, the distance or line segment from the center of a circle or sphere to any point on its boundary.
NOUN
C1
TECHNICAL
3
orsócsont
C1
Usage pattern:
the radius of [someone's] forearm
The X-ray showed a small fracture in the radius near the wrist.
A röntgen kis törést mutatott az orsócsonton, a csukló közelében.
She broke both her radius and ulna in the accident.
A balesetben az orsócsontja és a singcsontja is eltört.
Pain along the radius may indicate a stress fracture.
The surgeon inserted a metal plate to stabilize the radius.
Children often injure the distal radius when they fall on an outstretched hand.
Learner examples
He broke the radius in his right arm.
Eltört a jobb alkarjában az orsócsontja.
The doctor said the radius would heal in six weeks.
Az orvos azt mondta, hogy az orsócsont hat hét alatt összeforr.
The radius and the ulna are the two bones in the forearm.
An X-ray showed a problem with her radius.
He felt pain along the radius after the fall.
Common mistake:
Learners may think 'radius' here is related to the mathematical meaning, but in anatomy it is simply the name of a bone. Another common confusion is mixing up the 'radius' with the 'ulna'; the radius is on the thumb side of the forearm.
Meaning
outer bone in the forearm
Collocations
fractured radius
|broken radius
|radius and ulna
|distal radius fracture
|radius bone
Synonyms
forearm bone (A general, non-technical description; it does not clearly distinguish the radius from the ulna.)
Themes
medicine
|biology
|body
|health
|science
Definition
A long bone in your lower arm, on the thumb side, from the elbow to the wrist.
One of the two long bones in the human forearm, located on the same side as the thumb and running from the elbow to the wrist.
Grammar
Dictionary form
radius
IPA
GB/ɹˈeɪdiəs/
US/ɹˈeɪdiəs/
Syllables & stress
ra - di - us (3 syllables)
Stress on 1st syllable (ra)
Word forms
Noun
- Base: radius
- Plural: radii, radiuses
Word family
Expressions
within a radius of
1/wɪðˈɪn ə ɹˈeɪdiəs əv/
fixed phrase
inside a stated circular area
In any place around a center, but not farther than the distance that is said.
Examples
- The company will deliver for free to customers living within a radius of 10 kilometers.
- There are three schools within a radius of five miles of our house.
- Police searched all cars within a radius of two kilometers of the crime scene.