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21 Cards in this Set
- Front
- Back
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Point |
An exact location in space. No length, width, or thickness |
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Line |
A straight path connecting two points and extending endlessly in both directions. |
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Plane |
A flat surface extending endlessly in all directions. It is named by three noncollinear points (points that don’t form a line) |
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Parallel lines |
In the same plane and never intersect, no common point |
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Intersecting lines |
Share a common point |
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Perpendicular lines |
Lines that cross at a right angle (90 degrees) |
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Ray |
A part of a line that extends endlessly in one direction. It has only one endpoint which is named first |
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Angle |
Has two rays that share a common endpoint (vertex) |
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Right angleAcute |
Measures 90° perpendicular lines intersect and form a right angle |
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Acute angleObtuse angle |
Measures less than 90° |
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Obtuse angle |
Measures greater than 90° and less than 180° |
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Straight angleComplementary |
Measures 180° |
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Complementary angles |
The measures of two complementary angles have a sum of 90° when placed side-by-side the form a right angle |
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Supplementary angles |
The measures of two supplementary angles have a sum of 180° when placed side-by-side they form a straight angle |
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Line segment |
A part of a line having two endpoints |
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PolygonVertex |
A closed figure made of line segments (classified by the number of sides) |
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Vertex |
The common endpoint of a pair of sides |
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Interior angle |
Formed by two sides that share a vertex |
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Regular polygon |
All the same sides are the same length and all the angles are the same measure |
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Irregular polygon |
Sides that have different lengths and/or the angles have different measures |
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Not a polygon |
Any sides are curved the figure is not closed |
