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

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

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

a straight line connecting opposite corners of a flat shape at an angle

(geometry) a shape that consists of a line alternating its direction to left and right

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

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

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

a pair of geometric figures, such as lines or planes, that do not meet or intersect, no matter how far they are extended

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

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

a line that crosses a curve at least at two distinct points

a pair of adjacent angles formed by two intersecting lines, which add up to 180 degrees

an angle that measures between 0 and 90 degrees, which is less than a right angle (90 degrees)

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

an angle measuring exactly 90 degrees

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

an angle that measures either less or more that 90 degrees

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

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

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

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

two angles that share a common vertex and a common side, but do not overlap, and are not in a straight line

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

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

a curved shape, or something shaped this way

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

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

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

something that resembles a spiral or coil

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

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

(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

a geometric curve formed by the intersection of a plane with two cones, resulting in two symmetrical branches

a continuous curve that does not intersect itself, and can be traced without lifting the pen or pencil from the paper

a curve that intersects itself, or has overlapping segments, requiring the pen or pencil to be lifted from the paper while tracing it

a curve that does not intersect itself and has distinct endpoints, meaning it does not form a closed shape or loop

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