40 terms

5th grade geometry

STUDY
PLAY
volume
A measure of how much space a solid (3-dimensional) object takes up OR how much a container will hold.
units³
Volume is measured in cubic units.
area
The amount of surface inside a closed figure.
units²
Area is measured in squared units.
perimeter
The distance around a 2-dimensional shape - the outside "rim" of the shape.
reflection
The "flipping" of a figure over a line so that its image is the mirror image of the original figure.
area of a triangle
A = ½ b * h
area of a rectangle OR parallelogram
A = b * h
volume of a prism
V = B * h where "B" is the area of the base of the prism and "h" is the height of the prism
acute angle
an angle less than 90 degrees but more than 0 degrees
obtuse angle
an angle that measures more than 90 degrees but less than 180 degrees
right angle
an angle that measures exactly 90 degrees
reflex angle
an angle greater than 180 degrees (but less than 360)
base
the bottom side of a geometric figure
determine
reach, make, or come to a decision about something
dimension
the measurements of an object's length, width, and height
function machine
An imaginary machine used in MATHEMATICS to change numbers according to a given rule.
evaluate
solve (find the answer); judge
linear
measured lengthwise
symmetry
exact correspondence of form on opposite sides of a dividing line
equilateral triangle
a triangle with three congruent/equal sides
isosceles triangle
A triangle with at least two congruent sides
obtuse triangle
a triangle with one interior obtuse angle
right triangle
a triangle with one right angle
variable
a letter that represents one or more numbers that can be changed
polygon
A closed plane figure made up of line segments with many (poly) angles (three or more)
pentagon
a five-sided polygon
octagon
An eight-sided polygon
hexagon
a six-sided polygon
congruent
same shape and same size
trapezoid
a quadrilateral with two parallel sides
vertex
The common endpoint of an angle
rhombus
A rhombus is a quadrilateral whose sides are all the same length (congruent) and whose opposite interior angles are the same size (congruent.) Really, a ________ is just a square that someone sat on and squished! (ouch)
quadrilateral
a polygon with 4 sides
point
A precise location or place on a plane. Usually represented by a dot.
parallelogram
Opposite angles of a __________ are the same size/measure (congruent.)
Opposite sides of a __________ are parallel... Uh... You think that's where it got it's name? This is a rectangle that a giant sat on and squished.
parallel
Two lines (lying in the same plane) are parallel if they never intersect... This means that the two lines are always the same distance apart. Lines that will never meet, no matter how long you stretch them (like railroad tracks!)
line segment
a part of a line that has two endpoints
line
a straight path that extends without end in opposite directions
intersecting lines
lines that cross at one point
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