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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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Words Related to Colors and Shapes
axis
[noun]

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

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cross
[noun]

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

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diagonal
[noun]

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

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parallel
[noun]

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

Ex: The design features two parallels that run alongside each other .
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a line or structure that meets another at a right angle, creating a 90-degree intersection

Ex: The street intersected with another at perpendicular.
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tangent
[noun]

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

Ex: The artist 's sketch showed a spiral with tangent lines , illustrating the various points of contact .
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secant
[noun]

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

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

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an angle measuring exactly 90 degrees

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an angle that measures either less or more that 90 degrees

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

Ex: The windmill 's rotating blades sweep through a plane angle.
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arc
[noun]

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

Ex: When measuring arc, it is important to identify the center of the circle .
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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

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curl
[noun]

something that resembles a spiral or coil

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spiral
[noun]

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

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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

Ex: The quadratic function ’s graph is always parabola.
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hyperbola
[noun]

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

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Colors and Shapes
Lines, Angles, and CurvesWords Related to Shapes
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