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36 Cards in this Set

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  • Back
equilateral triangle
triangle with all three sides equal in length; all angles have the same measure
faces
flat surface on a
3-dimensional shape
pentagon
polygon with 5 sides
flips=reflections
The flipping of a figure over a line so that its image is the mirror image of the original
intersecting lines
lines which meet or cross one another
perimeter
distance around a closed 2-dimensional shape
heptagon
polygon with 7 sides
hexagon
polygon with 6 sides
edges
line segments where two faces of a polyhedron meet
right angle
angle measuring 90
cylinder
3-dimensional shape with two circular bases that are parallel and congruent and are connected by a curved surface; a can is a cylinder
parallel
never meeting and always the same distance apart
point
an exact location in space; the center of a circle is a point
irregular polygon
polygon with sides of different lengths or angles of different measures
congruent
having exactly same shape and size
obtuse angle
angle measuring greater than 90 and less than 180
perpendicular
meeting at right angles
polygon
a closed, 2-dimensional figure that is made up of line segments joined end to end
quadrilateral
polygon that has 4 sides
similar
exactly the same shape but not necessarily the same size
angle
figure that is formed by two rays or two line segments with a common endpoint
acute angle
angle measuring greater than 0 and less than 90
radius/radii
line segment from the center of a circle to any point on the circle; also, the length of such a line segment
cube
a polyhedron with 6 square faces; has 8 vertices and 12 edges
parallelogram
quadrilateral with 2 pairs of paralles sides; opposite sides of a parallelogram are congruent
circumference
the distance around a circle or a sphere; the perimeter of a circle
isosceles triangle
triangle with at least two sides that are the same length; at least two angles have same measures
area
the amount of surface inside a closed boundary; measured in square units
rectangle
parallelgram with 4 right angles
nonagon
polygon with 9 sides
degrees
unit of measure for angles based on dividing a circle into 360 equal parts; also unit of measure for temperature
regular polygon
polygon whose sides are all the same length and whose angles are all equal
cone
a 3-dimensional shape that has a circular base, a curved surface, and one vertex which is called the apex.
rectangular prism
a prism whose faces (including bases) are all rectangles
octagon
polygon with 8 sides
cubic units
a unit used in measuring volume, such as cubic centimeters or cubic feet.