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Math Vocab 51-113

Vocabulary 51-113

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