出典:Wiktionary
Borrowed from Latin Anglus, in turn borrowed from a Germanic source (compare 古期英語 Ængle/Engle (“Angle”)). Probably derived from the toponym Angle, related to Proto-Germanic *anguz "narrow, tight; tapering, angular", either indicating the "narrow" water (i.e. the Schlei estuary), or the "angular" shape of the peninsula.
Folk etymology linking the word to English angel or any antecedents is demonstrably false.(Can this(+) etymology be sourced?)
出典:Wikipedia
出典:『Wikipedia』 (2011/08/05 03:53 UTC 版)
In geometry, an angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle. The magnitude of the angle is the "amount of rotation" that separates the two rays, and can be measured by considering the length of circular arc swept out when one ray is rotated about the vertex to coincide with the other (see "Measuring angles", below). Where there is no possibility of confusion, the term "angle" is used interchangeably for both the geometric configuration itself and for its angular magnitude (which is simply a numerical quantity).
角度の
of an angle
a right angle
直角.
a right angle
take the angle
to measure an angle
鋭角.
a sharp angle
対角.
鋭角.
直角に
立体角.
the bow
to stand upon points―to be punctilious
入射角.
the instep
ふた