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an imaginary line in the middle of an object around which the object revolves
軸, 仮想線
(geometry) an arbitrary straight line that passes through the center of a symmetrical object or around which an object spins
軸, 中心線
a mark or an object formed by two short lines or pieces crossing each other
十字, バツ印
a straight line connecting opposite corners of a flat shape at an angle
対角線, 斜め線
(geometry) a shape that consists of a line alternating its direction to left and right
ジグザグ, 折れ線
a straight line that is terminated by a secondary line at each end, resembling the letter H
バルビス, 各端で二次的な線によって終端される直線で、文字Hに似ている
a pair of geometric figures, such as lines or planes, that do not meet or intersect, no matter how far they are extended
平行, 平行線
a line or structure that meets another at a right angle, creating a 90-degree intersection
垂直, 垂直線
a straight line that touches a curve or surface at exactly one point, known as the point of tangency
接線, タンジェント線
a line that crosses a curve at least at two distinct points
割線, セカント線
a pair of adjacent angles formed by two intersecting lines, which add up to 180 degrees
線形対, 隣接角の対
an angle that measures between 0 and 90 degrees, which is less than a right angle (90 degrees)
鋭角, 90度未満の角度
an angle that measures more than 90 degrees but less than 180 degrees
鈍角, 凹角
an angle measuring exactly 90 degrees
直角, 90度の角度
an angle that measures exactly 180 degrees, which is the same as a straight line
平角, 180度の角度
an angle that measures either less or more that 90 degrees
斜角, 直角でない角
a complete revolution or turn around a fixed point or axis, covering a 360-degree angle
完全な回転, 360度の回転
an angle measured counterclockwise from the initial side of a reference angle in standard position, usually expressed in degrees or radians
正の角度, 正の方向の角度
an angle measured clockwise from the initial side of a reference angle in standard position, usually expressed in degrees or radians
負の角度, 時計回りの角度
two angles that share a common vertex and a common side, but do not overlap, and are not in a straight line
隣接角, 接角
the measure of the tilt between two lines or surfaces in two-dimensional space, typically given in degrees or radians
平面角, 二面角
(geometry) a part of a circle, which is curved
弧, 円の一部
a curved shape with narrow points at the ends that appears wider in the middle, like the shape of the moon in its first and last quarters
三日月, 新月
something that resembles a spiral or coil
カール, 螺旋
(geometry) a curved shape or design that gradually winds around a center or axis
螺旋, 渦巻き
(geometry) a symmetrical open curve that is similar to the path of an object thrown into the air passes till it falls back to earth
放物線, 放物線曲線
a geometric curve formed by the intersection of a plane with two cones, resulting in two symmetrical branches
双曲線, 双曲線の曲線
a continuous curve that does not intersect itself, and can be traced without lifting the pen or pencil from the paper
単純曲線, 自己交差のない曲線
a curve that intersects itself, or has overlapping segments, requiring the pen or pencil to be lifted from the paper while tracing it
非単純曲線, 自己交差曲線
a curve that does not intersect itself and has distinct endpoints, meaning it does not form a closed shape or loop
開曲線, 開いた弧
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