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27 Cards in this Set
- Front
- Back
a part of a line that has two endpoints
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line segment
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lines that lie in the same plane and do not intersect; they are always the same distance apart
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Parallel
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lines that meet or cross at a common point
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intersecting
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two lines or line segments that cross or meet to form right angles
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perpendicular
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an angle made when two line segments meet to form a square corner; it measure 90 degrees
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right angle
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part of a line that starts at an endpoint and goes on forever in one direction
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ray
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a figure that is formed by two rays with the same endpoint
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angle
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points common to the sides of an angle or two sides of a polygon
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vertex
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an angle that measures more than 90 degrees and less than 180
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obtuse angle
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an angle that measures less than 90 degrees
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acute angle
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an angle that measures exactly 180 degrees; a straight angle forms a straight line
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straight line
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units for measuring angles or temperature
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degrees
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a device used to measure and draw angles
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protractor
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a simple closed plane figure made up of three or more line segments
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polygon
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a parallelogram with all four sides of the same length
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rhombus
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the line segments that make up a polygon
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sides
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a quadrilateral with only two parallel sides
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trapezoid
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a triangle that has three congruent sides
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equilateral triangle
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a triangle that has two congruent sides
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isosceles triangle
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a triangle with all sides of different lengths
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scalene triangle
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a triangle with one angle which measures 90 degrees
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right triangle
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a triangle with one obtuse angle
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obtuse triangle
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a triangle in which each of the three angles is acute
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acute triangle
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a point inside a circle at the exact middle
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center
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a segment that connects the center of a circle to any point on the circle
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radius
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a line segment that connects two points on the circle and passes through the center
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diameter
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a line segment that connects two points on a circle
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chord
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