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38 Cards in this Set
- Front
- Back
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point
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an exact location in space
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line
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a straight path of points that goes on and on in two directions
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plane
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an endless flat surface
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parallel lines
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in a plane, lines that never intersect
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intersecting lines
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lines that cross at one point
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perpendicular lines
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two intersecting liens that form right angles
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line segment
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a part of a line that has two endpoints
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ray
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a part of a line that was one endpoint and continues endlessly in one direction
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angle
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a figure formed by two rays that have the same endpoint
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right angle
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an angle that forms a square corner
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acute angle
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an angle that is less than a right angle
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obtuse angle
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an angle that measure between 90 and 180 degrees
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straight angle
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an angle that forms a straight line
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degree
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a unit of measure for angles
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unit angle
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an angle with a measurement of 1 degree
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angle measure
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the degrees of an angle
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protractor
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a tool used to measure
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polygon
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a closed plane figure made up on line segments
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side
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each of the line segments of a polygon
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vertex
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in an angle the common endpoint of two rays that form an angle
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triangle
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a polygon with 3 sides
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quadrilateral
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a polygon with 4 sides
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pentagon
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a plane figure with 5 sides
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hexagon
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a polygon with 6 sides
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octagon
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a polygon with 8 sides
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equilateral triangle
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a triangle in which all sides are the same length
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isosceles triangle
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a triangle that has at least two equal sides
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scalene traignel
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a triangle in which no sides are the same length
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right triangle
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a triangle with one right angle
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acute triangle
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a triangle with 3 acute angles
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obtuse triangle
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a triangle in which there is one obtuse angle
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rhombus
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a quadrilateral in which opposite sides are parallel and all sides are the same length
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trapezoid
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a quadrilateral with only one pair of parallel sides
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parallelogram
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a quadrilateral in which opposite sides are parallel
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rectangle
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a quadrilateral with 4 right angles
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square
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a quadrilateral with 4 right angles and all sides the same length
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symmetric
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a figure is symmetric if it can be folded into two congruent halves that fit on top of each other
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line of symmetry
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a line on which a figure can be folded so that both parts match exactly
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