Geometry Definitions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Point | An exact position in space.
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| Line | An infinite set of points forming a straight path extending in two directions.
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| Line segment | A part of a line defined by two endpoints.
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| Plane | A flat surface that extends infinitely in all directions.
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| Parallel Planes | Two planes can be parallel to each other, when they are parallel they are in a line.
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| Angle | Two rays that share an endpoint.
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| Vertex | The point at which two line segments,lines, or rays meet to form an angle.
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| Complementary Angles | Two angles what have measures with a sum of 90 degrees
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| Supplementary Angles | Two angles that have measured to 180 degrees.
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| Congruent Angles | When two angles have the same measurement of angles.
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| Acute Angle | An angle that measures less than 90 degrees.
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| Obtuse Angle | An angle with a measurement greater than 90 and less than 180 degrees.
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| Right Angle | An angle that measures 90 degrees.
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| Straight Angle | An angle that measures 180 degrees.
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| Reflex Angle | An angle that measures more than 180 degrees.
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| Circle | A closed curve with all of its points in one plane and the same distance from a fixed point.
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| Radius | The segment or the length of a segment from the center of a circle to a point on the circle.
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| Diameter | A chord that passes through the center of a circle and has endpoints on a circle.
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| Chord | Any line segment that joins tow points on a circle.
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| Arc | The part curved between any two of its points.
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| Cicumference | The measure in a square units of the interior region of a 2D or 3D figure.
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| Polygons | A closed figure formed from a line segments that meet on ly at their endpoints.
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| Acute Triangle | Measures less than 90 degrees.
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| Obtuse Triangle | Measures greater than 90 degrees
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| Right Triangle | Measures 90 degrees.
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| Scalene Triangle | All sides measure different
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| Isosceles Triangle | 2 sides measure the same
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| Equilateral Triangle | All sides have the same measurement
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| Parallelogram | A quadrilateral with two pairs of parallel and congruent angles
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| Square | Parallelogram with 4 congruent sides and angles that are 90 degrees.
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| Recdtangle | A quadrilateral with two pairs of congruent parallel sides and four right angles
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| Rhombus | A parallelogram where all 4 sides are equal in length.
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| Trapezoid | A quadrilateral with exactly one pair of parallel sides
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| Pentagon | A polygon that has 5 sides
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| Hexagon | A polygon that has 6 sides
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| Octagon | A polygon that has 8 sides
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| Ray | A part of a line with one end point and extends indefinitely in one direction
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| Parallel Lines | Lines that always same the same distance apart and will never touch.
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| Perpendicular LInes | Lines that intersect and form a right angle.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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