Japanese word

半径

Pronunciation

Romajihankei

Meaning

  • nounradius

Example

この円の半径を測ります。ko no en no han kei o haka ri ma su

I measure the radius of this circle.

Illustration for 半径 (radius)

More examples

この円の半径は五センチです。ko no en no han kei wa go se n chi de su

The radius of this circle is five centimeters.

Core concept

Refers to the distance from the center of a circle or sphere to its outer edge or surface.

Common phrases

  • 半径を測るhan kei o haka ru

    measure the radius

  • 半径を求めるhan kei o moto me ru

    calculate the radius

  • 半径が大きいhan kei ga ō ki i

    have a large radius

Definition in Japanese

円や球の中心と、その円周または球面上の一点との距離。en ya tama no chū shin to so no en shū ma ta wa kyū men jō no ichi ten to no kyo ri

Word origin

半径 (hankei) is formed from 半 (han, "half") and 径 (kei, "diameter"), because a radius is half the diameter.

Usage tips

  • A circle drawn with a compass keeps the 半径 (hankei) fixed while the point moves around the center, which defines the circle's shape.

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