geometry 5th
Terms
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- 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.