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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(geometry) an arbitrary straight line that passes through the center of a symmetrical object or around which an object spins
a straight line that is terminated by a secondary line at each end, resembling the letter H
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 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 exactly 180 degrees, which is the same as a straight line
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
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
(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
