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(geometry) an arbitrary straight line that passes through the center of a symmetrical object or around which an object spins
轴
(geometry) a straight line that joins the opposite corners of a flat shape at an angle
对角线
(geometry) a shape that consists of a line alternating its direction to left and right
之字形, 之字形（几何学）
a straight line that is terminated by a secondary line at each end, resembling the letter H
巴尔比斯, H形直线
(mathematics) any of the pair of geometric figures such as lines or planes which do not meet or intersect
平行线
a line or structure that meets another at a right angle, creating a 90-degree intersection
垂线, 垂直
a straight line that touches a curve or surface at exactly one point, known as the point of tangency
切线
a pair of adjacent angles formed by two intersecting lines, which add up to 180 degrees
线性对
an angle that measures between 0 and 90 degrees, which is less than a right angle (90 degrees)
锐角, 尖角
an angle that measures exactly 180 degrees, which is the same as a straight line
直角, 平角
an angle that measures greater than 180 degrees but less than 360 degrees
反射角, 大于180度的角
a complete revolution or turn around a fixed point or axis, covering a 360-degree angle
完整旋转, 完整革命
an angle measured counterclockwise from the initial side of a reference angle in standard position, usually expressed in degrees or radians
正角, 逆时针测量的角
an angle measured clockwise from the initial side of a reference angle in standard position, usually expressed in degrees or radians
负角, 顺时针测量的角
two angles that share a common vertex and a common side, but do not overlap, and are not in a straight line
邻接角, 相邻角
the measure of the tilt between two lines or surfaces in two-dimensional space, typically given in degrees or radians
平面角, 面角
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
新月, 月牙
(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
抛物线
a geometric curve formed by the intersection of a plane with two cones, resulting in two symmetrical branches
双曲线
a continuous curve that does not intersect itself, and can be traced without lifting the pen or pencil from the paper
简单曲线
a curve that intersects itself, or has overlapping segments, requiring the pen or pencil to be lifted from the paper while tracing it
非简单曲线, 自交曲线
a curve that does not intersect itself and has distinct endpoints, meaning it does not form a closed shape or loop
开放曲线, 未闭合曲线
