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Geometry unit 1 4th

vocabulary to know

acute angle an angle that measures less than a right angle; an angle that has a measure of less than 90 degrees
line a straight path that continues without ending in both directions; think Buzz Light Year "To infinity and beyond!"
line of symmetry an imaginary line that divides a shape into 2 matching parts
obtuse angle an angle that measures greater than a right angle; an angle that has a measure of more than 90 degrees
ray a part of a line that is straight and has one end point and continues without ending in one direction
right angle an angle that forms a square corner and has a measure of 90 degrees
line segment a part of a line that is straight and has 2 end points
angle a figure formed by 2 rays or 2 line segments and has a common endpoint called the vertex
perpendicular lines two lines that intersect to form a right angle
parallel lines lines that never meet
intersecting lines lines that meet or touch or cross
straight angle forms a straight line; measures 180 degrees
polygon closed flat shape with straight sides
vertex point where 2 sides of a polygon meet
triangle polygon with 3 sides
quadrilateral polygon with 4 sides
pentagon polygon with 5 sides
hexagon polygon with 6 sides
octagon polygon with 8 sides
equilateral triangle triangle with all sides the same length
isosceles triangle triangle with 2 sides same length and 1 side a different length; think SOS - same-odd man out-same
scalene triangle triangle with no sides the same length
right triangle triangle with 1 right angle
acute triangle triangle with 3 acute angles (less than 90 degrees)
obtuse triangle triangle with 1 obtuse angle (greater than 90 degrees
rhombus figure with opposite sides parallel and all sides the same length
trapezoid a figure with only 1 pair of parallel sides
parallelogram a figure with 2 pairs of opposite parallel sides
rectangle a figure with 4 right angles and opposite parallel sides
square a figure with 4 right angles and 4 sides that are the same length
Created by: pdeprosse