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[Directly] proportional quantities.

Q: What are quantities that have a constant ratio or rate?

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Proportional

Rate

The diameter and circumference of a circle.

Direct variation.

A rate is the ratio of both those quantities.

Related questions

Proportional

Proportional

The answer is proportional.

Two quantities are said to be proportional if they vary in such a way that one of the quantities is a constant multiple of the other, or equivalently if they have a constant ratio.

rate

Rate

The diameter and circumference of a circle.

It is a direct proportion.

A rate.

both represents quantities

A rate.

A rate.