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6th Math 3rd 9 wks.

vocabulary for RISD's 3rd 9 weeks

vocabulary worddefinition
line a straight path that extends infinitely in opposite directions
line segment a part of a line with 2 endpoints
midpoint the point on a line segment that divides it into 2 congruent parts
ray a part of a line that has one endpoint and extends forever in the opposite direction
intersecting lines two lines that cross at exactly one point
perpendicular lines lines that intersect at one point and form right angles
parallel lines two lines in the same plane that never intersect
skew lines lines that lie in different planes and are neither parallel nor intersecting
right angle an angle with a measure of 90 degrees
obtuse angle an angle with a measure of more than 90 degrees but less than 180 degrees
acute angle an angle that measures greater than 0 degrees and less than 90 degrees
adjacent angles angles that share a common ray, have a common vertex and do not overlap
vertical angles a pair of opposite congruent angles formed by intersecting lines
vertex/vertices the point where 2 rays meet, where 2 sides of a polygon meet, or where the edges of a 3-dimensional shape meet; the top point of a cone or pyramid
straight angle an angle whose measure is 180 degrees
right triangle a triangle with one right angle
obtuse triangle a triangle with one obtuse angle
acute triangle a triangle with 3 acute angles
scalene triangle a triangle with no congruent sides
equilateral triangle a triangle with 3 equal sides
isosceles triangle a triangle with two congruent sides
congruent having the same shape and the same size
symmetry a figure has line symmetry if a line can divide the figure into 2 congruent parts
transformation a change in size, shape, or position of a geometric figure
reflection a transformation that produces a mirror image of a geometric figure (flip)
translation a transformation that moves a geometric figure by sliding each of the points the same distance in the same direction (slide)
rotation a transformation of a figure by turning it about a fixed point (turn)
quadrilateral a four sided polygon
pentagon a five sided polygon
hexagon a six sided polygon
octagon an eight sided polygon
decagon a ten sided polygon
rhombus a parallelogram whose 4 sides are congruent and whose opposite angles are congruent
parallelogram a quadrilateral with opposite sides parallel and congruent
trapezoid a quadrilateral that only has one pair of parallel sides
polygon a closed figure made of line segments
regular polygon a polygon in which all sides are the same length and all angles have the same measure
prism a 3 dimensional shape with 2 parallel, congruent bases; all other faces are parallelograms
cylinder a 3 dimensional figure with 2 parallel bases that are congruent circles
sphere a 3 dimensional shape with all points an equal distance from the center
cone a 3 dimensional shape with a circular base, a curved surface, and one vertex
face a flat surface of a 3 dimensional shape
edge the line segment where 2 faces of a 3 dimensional shape meet
customary system of measurement the measurement system used most often in the United States
Metric System of Measurement a measurement system used throughout the world based on multiples of 10
gram a standard unit for measuring mass (weight) in the metric system
liter a metric system of measurement for capacity
meter a metric system unit for measuring distance
capacity a measure of liquid a container will hold
degree a unit of measure for angles and for temperature
area the number of square units needed to cover a surface (all of the inside of a shape)
perimeter the distance around a 2 dimensional shape
Pi the ratio of the circumference of a circle to its diameter
circumference the distance around a circle
radius a line segment from the center of a circle to any point on the circle
central angle an angle that has its vertex at the center of a circle
chord a line segment whose endpoints are on the circle
volume the number of cubic units needed to fill the space occupied by a solid
diameter a line segment that passes through the center of a circle and has endpoints on the circle
cubic units what volume is measured in
Created by: ltimmermann