diameter

直径

円や丸い物の中心を通って測る、端から反対側の端までの距離。

やさしい英語で： The distance across a circle or round object, measured through its center.

• What is the diameter of this plate?
• The wheel measures fifty centimeters in diameter.
• We need pipes with a larger diameter.

使い方： a diameter of + measurement (The pipe has a diameter of ten centimeters.); measurement + in diameter (The plate is thirty centimeters in diameter.)

よく使う表現： in diameter, small diameter, outside diameter

直径

円の中心を通り、円周上の向かい合う二点を結ぶ線分。

やさしい英語で： A straight line across a circle, passing through its center and joining opposite edges.

• Draw a diameter across the circle.
• Every diameter passes through the center.
• Two diameters divide the circle into four parts.

使い方： diameter of something (Draw a diameter of the circle through point A.)

よく使う表現： draw a diameter, diameter of something