R

/ˈɑː/

/ˈɑɹ/

the length of a line segment between the center and circumference of a circle or sphere

the 18th letter of the Roman alphabet

a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air

(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole

/ˈɑː/

/ˈɑːɹ/

describing a motion picture that people under the age of 17 need a guardian or parent in order to watch it

Example

The circumference of a semicircle is C = π * r, showcasing the presence of pi in geometric calculations.

Language learners may spend time practicing the skill of rolling 'r' sounds to achieve accurate pronunciation in various languages.

Russian speakers often roll the 'r' sound.

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