geometry vocabulary -...
TRANSCRIPT
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Geometry Vocabulary
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Angle
Made up of 2 rays joined together at a common point called a vertex.
The angle is
ABC
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Circle
• The set of points on a plane at a certain distance, or radius, from a single point, the center
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Perpendicular Line
Two lines that intersect at a right angle (90°).Written as AB PQ
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Parallel Line
Lines in a plane that either do not share any points and never intersect, or share all points.Written as AB PQ
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Line Segment
A line with two endpoints.Written as AB
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Point
Point A
or
Point B
An exact position or location in a given plane.
Is represented by a dot and named with a capital letter.
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Line
The set of points between points in a plane and the infinite number of points that continue beyond the points.
Written as PQ
P
Q
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Ray A line that has one endpoint and continues on forever in the opposite direction.
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Right Angle
An angle that measures 90°.
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Acute Angle
An angle measuring less than 90° but greater than 0°.
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Obtuse Angle
An angle measuring greater than 90° but less than 180°.
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Straight Angle
An angle measuring exactly 180°.
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A triangle with no congruent sides.
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A triangle with two congruent sides.
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Points that lie in the same plane.
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Points that lie on the same line.
AR M
A, R, & M are collinear points
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Congruent
Figures are congruent if they have the same shape, size, lines, and angles.
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Two segments that have the same length.
OK
YA
𝑶𝑲 ≅ 𝒀𝑨
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Have the same shape but not necessarily the same size.
3
45
6
8 10
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To divide into two congruent parts.
L
K
M
𝑱𝑲 bisects LJM
J
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The point that divides a segment into two congruent segments.
O BC
O is the midpoint of 𝑪𝑩
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A closed plane figure formed by three or more segments such that each
segment intersects exactly two other segments only at their endpoints and
no two segments with a common endpoint are collinear.
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A polygon that is both equilateral and equiangular.
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Equilateral
•Having all sides the same length
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Altitude
a line that extends from one vertex of a figure perpendicular to the opposite side, this is the height of figure.
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Perpendicular Bisector
•A line which cuts a line segment into two equal parts at a 90° angle
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A
B C
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A corner or point where lines, rays, polygons, or other geometric figures meet.
vertex