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Words Related to Colors and Shapes - Lines, Angles, and Curves
Read this lesson to learn the names of some lines, angles, and curves in English, such as "ray", "acute angle" and "arc".
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axis
[noun]
(geometry) an arbitrary straight line that passes through the center of a symmetrical object or around which an object spins
diagonal
[noun]
(geometry) a straight line that joins the opposite corners of a flat shape at an angle
zigzag
[noun]
(geometry) a shape that consists of a line alternating its direction to left and right
balbis
[noun]
a straight line that is terminated by a secondary line at each end, resembling the letter H
ray
[noun]
a straight line with one endpoint that extends infinitely in the other direction
line segment
[noun]
a portion of a straight line that is defined by two distinct endpoints
parallel
[noun]
(mathematics) any of the pair of geometric figures such as lines or planes which do not meet or intersect
perpendicular
[noun]
a line, segment, or structure that meets another at a right angle, creating a 90-degree intersection
tangent
[noun]
a straight line that touches a curve or surface at exactly one point, known as the point of tangency
linear pair
[noun]
a pair of adjacent angles formed by two intersecting lines, which add up to 180 degrees
acute angle
[noun]
an angle that measures between 0 and 90 degrees, which is less than a right angle (90 degrees)
straight angle
[noun]
an angle that measures exactly 180 degrees, which is the same as a straight line
reflex angle
[noun]
an angle that measures greater than 180 degrees but less than 360 degrees
full rotation
[noun]
a complete revolution or turn around a fixed point or axis, covering a 360-degree angle
positive angle
[noun]
an angle measured counterclockwise from the initial side of a reference angle in standard position, usually expressed in degrees or radians
negative angle
[noun]
an angle measured clockwise from the initial side of a reference angle in standard position, usually expressed in degrees or radians
adjacent angles
[noun]
two angles that share a common vertex and a common side, but do not overlap, and are not in a straight line
plane angle
[noun]
the measure of the tilt between two lines or surfaces in two-dimensional space, typically given in degrees or radians
conic section
[noun]
(geometry) a shape formed when a circular cone is intersected by a plane
crescent
[noun]
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
spiral
[noun]
(geometry) a curved shape or design that gradually winds around a center or axis
parabola
[noun]
(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
hyperbola
[noun]
a geometric curve formed by the intersection of a plane with two cones, resulting in two symmetrical branches
simple curve
[noun]
a continuous curve that does not intersect itself, and can be traced without lifting the pen or pencil from the paper
non-simple curve
[noun]
a curve that intersects itself, or has overlapping segments, requiring the pen or pencil to be lifted from the paper while tracing it
open curve
[noun]
a curve that does not intersect itself and has distinct endpoints, meaning it does not form a closed shape or loop
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