Plane angle
01
平面角, 二面角
the measure of the tilt between two lines or surfaces in two-dimensional space, typically given in degrees or radians
例
The clock 's hands form a plane angle at noon.
時計の針は正午に平面角を形成します。
A corner of a book forms a right plane angle.
本の角は直角の平面角を形成します。
