perimeter

外周、周囲

ある区域の外側の縁や境界。

やさしい英語で： The outside edge or boundary of an area.

• A fence surrounds the perimeter.
• Guards walked around the perimeter of the building.
• The police secured the perimeter before entering the site.

使い方： perimeter of something (Guards patrolled the perimeter of the camp.)

類義語： boundary, outer edge

よく使う表現： perimeter fence, secure the perimeter, around the perimeter

周長

平面図形の外側の辺をすべて合わせた長さ。

やさしい英語で： The total distance around the outside of a flat shape.

• Find the perimeter of this square.
• We added the side lengths to calculate the perimeter.
• What is the perimeter of a rectangle with these dimensions?

使い方： perimeter of something (The perimeter of the square is twenty centimeters.)

よく使う表現： calculate the perimeter, perimeter of something, rectangle perimeter