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Polygons ~ Unit 7
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Terms in this set (27)
line segment
part of a line with two ends, called endpoints
line
a straight path that goes on forever in both directions, represented by arrows on each end
parallel
two lines or line segments that are the same distance apart that will never cross or meet
perpendicular
two lines or line segments that cross or meet to form square corners
ray
part of a line that has one endpoint and continues on forever in one direction
angle
two line segments or two rays that meet at an endpoint FORM this
vertex
the point where two line segments or rays meet to form an angle is called this
vertices
plural form of vertex
right angle
an angle that forms a square corner
obtuse
an angle that is greater than a right angle
acute
an angle smaller than a right angle
triangle
a polygon with three sides, three vertices, and three angles
polygon
a flat closed figure made up of line segments that do not cross each other
concave
line segments with endpoints inside the polygon, and a point on the line segment that is outside the polygon
convex
a polygon with endpoints that do not go inside the polygon
quadrilateral
polygon with 4 sides, 4 vertices, and 4 angles
decagon
a polygon with 10 sides, 10 vertices, and 10 angles
hexagon
a polygon with 6 sides, 6 vertices, and 6 angles
octagon
a polygon with 8 sides, 8 vertices, and 8 angles
pentagon
a polygon with 5 sides, 5 vertices, and 5 angles
heptagon
a polygon with 7 sides, 7 vertices, and 7 angles
nonagon
a polygon with 9 sides, 9 vertices, and 9 angles
parallelogram
a quadrilateral in which BOTH pairs of opposite sides are parallel
rectangle
a parallelogram with four right angles
square
a rectangle in which all four sides are the same length
rhombus
a parallelogram in which all four sides are the same length, but do NOT have to form square corners
trapazoid
a quadrilateral with exactly ONE pair of parallel opposite sides
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