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radius

Pronunciation: [ˈreɪdiəs]

Word

Learn how to use radius in a sentence: 9 audio examples across 3 meanings.

Context: “geometry”

(noun) the distance from the center of a circle to any point on its edge. Imagine a circle like a pizza—the radius is like the line from the middle of the pizza to the crust.

Example

The radius of the pizza is 10 inches, making it a nice size for sharing.

Example

If the radius were smaller, we wouldn't have enough pizza for everyone.

Example

What is the radius of this circle drawn on the paper?

Context: “math/technology”

(noun) the length of a line used in calculations, especially in formulas that involve circles. This helps us find things like the area or circumference of the circle.

Example

Using the radius of 5 centimeters, we calculated the area of the circle.

Example

Without the correct radius, our calculations would not be accurate.

Example

How do we use the radius to find the area of the circle?

Context: “science/medicine”

(noun) the distance from a central point to the limit of a certain area or effect. Like how far you can hear sound or feel a breeze from a fan.

Example

The radius of the sound from the speaker was loud enough to be heard across the room.

Example

The radius of the smell from the cookies baking didn't reach the next room.

Example

What is the effective radius for this light bulb?

How to pronounce radius

Pronunciation: [ˈreɪdiəs]

Listen and repeat as many times as you need.

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