内角(ないかく)

ないかく
noun
interior angle (math); inside corner (baseball)
sciencesports
1. interior angle (of a polygon)
In geometry, the angle formed inside a polygon at one of its vertices. The interior angles of a triangle sum to 180°; for an n-gon the sum is 180°×(n−2).
三角形(さんかっけい)の内角(ないかく)を足(た)す。
Add up the interior angles of a triangle.
多角形(たかっけい)の内角(ないかく)の和(わ)を求(もと)める。
Find the sum of the interior angles of a polygon.
正(せい)六角形(ろっかくけい)の一(ひと)つの内角(ないかく)は百二十度(ひゃくにじゅうど)だ。
One interior angle of a regular hexagon is one hundred twenty degrees.
2. inside corner of the strike zone (baseball)
In baseball, the side of the strike zone closer to the batter. Pitchers throw a 内角(ないかく) to back the batter off the plate.
内角(ないかく)を攻(せ)める。
Pitch to the inside corner.
内角(ないかく)低(ひく)めのストライクをとった。
He got a strike low and inside.
ピッチャーは内角(ないかく)高(たか)めの速球(そっきゅう)でバッターを詰(つ)まらせた。
The pitcher jammed the batter with a high inside fastball.

Compound of 内(ない) (inside) + 角(かく) (angle / corner). The geometric sense is by far the more common one; the baseball sense is a specialized extension. Not to be confused with the homophone 内閣(ないかく) (the Cabinet).

COMMON COLLOCATIONS (math):

  • 内角(ないかく)の和(わ): sum of interior angles
  • 内角(ないかく)を求(もと)める: to find the interior angle

COMMON COLLOCATIONS (baseball):

Similar words

  • 外角(がいかく): exterior angle (math) / outside corner (baseball)

Related Words

Related: 多角形(たかくけい) (polygon)
general
Added 2026.6.7 11:04 · Revised 2026.9.2 13:02
28500/28901_naikaku