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Getting into Shapes - M3
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Terms in this set (49)
Acute angle
an angle whose measure is greater than 0˚ but less than 90˚
Closed shape
a shape that connects back on itself. A closed shape can be drawn using one continuous stroke.
Congruent
equal in measure. Identical in size and shape, but may have a different location and orientation.
Obtuse angle
an angle whose measure is greater than 90˚ but less than 180˚
Parallel lines
two or more lines in the same plane that do not intersect and remain a constant distance from one another
Parallelogram
a quadrilateral whose opposite sides are equal in length and parallel
Perpendicular lines
two lines that intersect to form right angles
Polygon
a simple, closed shape with three or more line segments as sides
Quadrilateral
a polygon with four sides
Rectangle
a parallelogram with four right angles. Note: a square is also a rectangle.
Rhombus
a parallelogram with four sides of equal length. Note: a square is also a rhombus.
Right angle
an angle that measures exactly 90˚
Simple shape
a shape that does not have any line segments that cross over each other.
Square
a parallelogram with four sides of equal length and four right angles
trapezoid
a quadrilateral with exactly one pair of opposite sides parallel.
Counterexample
a specific example that proves a mathematical statement is false
equilateral
a shape in which all sides are equal in length
regular polygons
polygons that have all angles congruent and all sides congruent
cone
a three-dimensional shape with one circular or elliptical base and one vertex
cross section
the face that results when a plane intersects a solid shape
cube
a rectangle prism with six square faces
cylinder
a three-dimensional shape with two non-polygonal congruent parallel bases, usually in the shape of a circle
edge
a line segment along which two faces of a three-dimensional shape meet
face
a flat side of a three-dimensional shape
polyhedron (pl. polyhedra)
a three-dimensional shape whose faces are polygons
prism
a polyhedron with two parallel congruent bases and rectangles or parallelograms for faces.
right prisms
prisms with rectangular faces
pyramid
a polyhedron that has one polygon as a base and triangular faces that taper to a point called the vertex.
rectangular prism
a polyhedron with six rectangular faces
(right) pentagonal prism
a polyhedron with seven faces, two of which are pentagons and five of which are rectangles
(right) triangular prism
a polyhedron with five faces, two of which are triangles and three of which are rectangles
sphere
a three-dimensional shape made up of all points that are equally distant from a point called the center
vertex (pl. vertices)
the common point of two sides of a polygon or three or more edges of a polyhedron
line of reflection
the line over which a figure is reflected or flipped. Figures can be reflected either over a horizontal ( - ) or vertical ( I ) line.
orientation
the final presentation of a figure after it has been transformed
position
the location of a figure on a two-dimensional space. Figures that have been translated or reflected change position. Rotated figures may or may not change position, depending on the point of rotation.
reflection
a transformation that flips a figure over a line
transformation
the mapping or movement of all the points of a figure in a plane according to a common operation. Reflections, rotations, and translations are types of transformations.
translation
a transformation that slides each point of a figure that same distance in the same direction
clockwise
rotating a figure in the direction of a clock
counterclockwise
rotating a figure the opposite direction of a clock
point of rotation
a fixed point used in the rotation of a figure or shape. The point can be within, on, or outside of the figure being rotated.
rotation
a transformation that turns a figure about a fixed point at a given amount in a specific direction
coordinate
one of the numbers in an ordered pair, such as the 2 in (2,3), that identifies its location on a coordinate graph
ordered pair
a pair of numbers used to describe the location of a point on a coordinate grid in relation to the origin (0,0). T
origin
the point of intersection (0,0) for the x- and y-axes on a coordinate graph.
quadrant
one of the four regions created by the intersection of the x- and y-axes at the point (0,0), known as the origin.
x-axis
the horizontal number line on a coordinate graph
y-axis
the vertical number line on a coordinate graph
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