##### Two dimensional shapes and their attributes

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created 8 years ago by Piazza
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1

point an exact position often marked as a dot

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line a straight path of points that is endless in two directions

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line segment a part of a line with two endpoints

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intersecting lines lines that cross at one point

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parallel lines lines that never cross

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ray a part of a line that has one endpoint and continues endlessly in one direction

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angle a figure formed by two rays that have the same endpoint.

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vertex plural: vertices 1. the point where two rays met to form an angle.
2. the points where the sides of a polygon meet
3. the points where 3 or more edges meet in a
solid figure that does not roll.
4. the pointed part of a cone

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right angle an angle that forms one square corner or 90 degree angle

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acute angle an angle that's open end measures less than a right angle

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obtuse angle an angle that's open measures more than a right angle

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perpendicular two lines, line segments or rays that form right angles

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polygon a closed figure made up of line segments

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side a line segment forming part of a polygon

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triangle a polygon with 3 sides and 3 vertices

16 a polygon with 4 sides and 4 vertices

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pentagon a polygon with 5 sides and 5 vertices

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hexagon a polygon with 6 sides and 6 vertices

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octagon a polygon with 8 sides and 8 vertices

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decagon a polygon with 10 sides and 10 vertices

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equilateral triangle a triangle with all sides the same length

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isosceles triangle a triangle with at least two sides the same length

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scalene triangle a triangle with no sides the same length

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right triangle a triangle with one right angle

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acute triangle a triangle with 3 acute angles

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obtuse triangle

a triangle with one obtuse angle

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trapezoid a quadrilateral with only one pair of parallel sides

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parallelogram a quadrilateral in which opposite sides are parallel

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rectangle a quadrilateral with four right angles. It is a special parallelogram

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rhombus a quadrilateral with opposite sides parallel and all sides the same length. Opposite angles are obtuse and the other opposite angles are acute. It is a special parallelogram

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square a quadrilateral with 4 right angles and all sides the same length. it is a special parallelogram and a combination of a rectangle and rhombus

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diagonal a line segment other that a side that connects two vertices of a polygon