颜色和形状 - 直线、角度和曲线

an imaginary line in the middle of an object around which the object revolves

轴

(geometry) an arbitrary straight line that passes through the center of a symmetrical object or around which an object spins

轴

a mark or an object formed by two short lines or pieces crossing each other

十字

(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

a straight line that is terminated by a secondary line at each end, resembling the letter H

巴尔比斯

a straight line with one endpoint that extends infinitely in the other direction

射线

a portion of a straight line that is defined by two distinct endpoints

线段

(mathematics) any of the pair of geometric figures such as lines or planes which do not meet or intersect

平行线

a line, segment, or structure that meets another at a right angle, creating a 90-degree intersection

垂直

a straight line that touches a curve or surface at exactly one point, known as the point of tangency

切线

a line that intersects a circle at two distinct points

割线

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

an angle that measures more than 90 degrees but less than 180 degrees

钝角

an angle measuring exactly 90 degrees

直角

an angle that measures exactly 180 degrees, which is the same as a straight line

直角

an angle that measures either less or more that 90 degrees

斜角

an angle that measures greater than 180 degrees but less than 360 degrees

反射角

a complete revolution or turn around a fixed point or axis, covering a 360-degree angle

完整旋转

an angle measured counterclockwise from the initial side of a reference angle in standard position, usually expressed in degrees or radians

正角

an angle measured clockwise from the initial side of a reference angle in standard position, usually expressed in degrees or radians

负角

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

the measure of the tilt between two lines or surfaces in two-dimensional space, typically given in degrees or radians

平面角

(geometry) a part of a circle, which is curved

弧

a curved shape, or something shaped this way

弧

a shape, line or surface that is hollow and is rounded inward

凹面

(geometry) a shape formed when a circular cone is intersected by a plane

圆锥曲线

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

something that resembles a spiral or coil

卷曲

(geometry) a curved shape or design that gradually winds around a center or axis

螺旋

(geometry) a closed plane curve that has two focal points

椭圆

(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

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

a curve that begins and ends at the same point, forming a closed loop

闭合曲线