Vocabulary 51-113
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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| prime number | a number having exactly 2 factors;
1 and itself
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| composite number | number having more than two factors.
Example: 6 is a composite number because its factors are 1,2, 3, and 6
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| array | An arrangement of objects in rows and columns
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| perimeter | the distance around the OUTSIDE of a figure
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| area | the number of units needed to cover the INSIDE surface of a figure
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| Greatest common factor(GCF) | the greatest factor that two or more
numbers have in common
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| least common multiple (LCM) | the least number other than zero, that is a
common multiple of two or more numbers
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| geometry | the study of lines, points, planes, angles, and surfaces
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| point | an exact place or location in space represented by a dot
labeled with a capital letter
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| endpoint | the point at the end of a line segment
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| line | a collection of points along a straight path that goes on forever
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| line segment | part of a line having 2 end points
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| parallel lines | lines extending in the same direction and are always the same distance apart
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| perpendicular lines | two lines or line segments that cross to form right angles
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| intersecting lines | lines that cross or meet
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| ray | a part of a line that has one endpoint
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| vertex | the comer point of an angle, polygon, or solid
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| angle | a figure formed by two rays that have a common endpoint
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| right angle | an angle measuring 90 degrees
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| acute angle | an angle measuring less than 90 degrees
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| obtuse angle | an angle measuring more than 90 and less than 180 degrees.
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| straight angle | an angle that measures 180 degrees
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| complementary angles | two angles whose measures have a sum of 90 degrees
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| supplementary angles | two angles whose measures have a sum of 180 degrees
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| protractor | a tool used for measuring or drawing angles
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| plane | a flat surface that goes on forever in all directions
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| intersecting planes | planes that intersect to form a line
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| similar | same shape, but not necessarily the same size
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| congruent | same size and shape
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| uni | 1
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| bi | 2
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| tri | 3
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| quad | 4
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| penta | 5
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| hexa | 6
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| hepta | 7
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| octa | 8
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| nona | 9
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| deci/deca | 10
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| centi | 100
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| milli | 1000
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| polygon | a closed figure formed by line segments
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| regular polygon | all sides and angles must be congruent within the shape
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| irregular polygon | all sides and angles are NOT congruent
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| diagonal | a line segment that joins two vertices of a polygon, but is not a side of a polygon
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| line of symmetry | a line along which you could fold a figure so both halves match
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| half-turn symmetry | if a figure matches itself exactly after a half turn about its center point, then it has half turn symmetry
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| rotational symmetry | if a figure is rotated less than 360 degrees around a central point and it still matches the original figure, then it has rotational symmetry
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| quadrilateral | a four sided polygon
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| square | a figure having four equal sides with four right angles
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| rectangle | a quadrilateral having four sided and four right angles
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| parallelogram | a quadrilateral with two sets of parallel sides
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| rhombus | a quadrilateral with four congruent sides
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| trapezoid | a quadrilateral with only one pair of parallel sides
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| triangle | a three sided figure
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| Triangles a classified by their _________ and __________. | sides, angles
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| equilateral triangle | a triangle with all congruent sides
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| isosceles triangle | a triangle with two congruent sides
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| scalene triangle | a triangle with NO congruent sides
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| right triangle | a triangle with a 90 degree angle
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| acute triangle | a triangle with 3 acute angles
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| obtuse triangle | a triangle with 1 obtuse angle
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| leg | in a right triangle, either of the two sides that form the right angle
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| hypotenuse | in a right triangle, the side opposite the right angle, it is the longest side in a right angle
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