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Transcript
Fifth Grade Geometry Vocabulary WORD Acute angle DEFINITION an angle whose measure is greater than 0 but less than 90 degrees Acute Triangle A triangle that has all three internal angles that are acute. Adjacent angles 2 non-straight and nonzero angles that have a common side in the interior of the angle formed by the noncommon sides Angle the union of 2 rays that have the same endpoint Bisecting Line a ray that is in the interior of an angle and forms two equal angles with the sides of that angle ASSOCIATED CONCEPTS five types of angles are zero, acute, right, obtuse, and straight Complementary 2 angles whose measures, when added together, equal 90 degrees angles Congruent Equal, exactly the same (size, shape, etc.) Conjecture an educated guess or opinion; a hypothesis Coordinate a number that identifies(or helps to identify) a point on Ex: (3,6) (x,y) also known as (Ordered Pairs) a number line (or on a plane) symbol Fifth Grade Geometry Vocabulary Coordinate plane a plane in which every point is identified with exactly 1 number and vice versa; a two-dimensional graph Decagon a ten-sided polygon Degree unit used to measure angles - the symbol for degrees Diagonal a segment in a polygon whose endpoints are 2 nonconsecutive vertices Equilateral Triangle Exterior angles All sides are equal in length Hexagon a six-sided polygon Intersecting Lines When two lines cross each other Isosceles triangle Line a triangle with two sides of equal length Line Segment the set of points consisting of two distinct points and all in between them angles outside of two lines cut by a transversal object that has no endpoints and continues on forever in a plane Fifth Grade Geometry Vocabulary Measure the amount of openness in an angle Obtuse angle an angle whose measure is greater than 90 but less than 180 degrees Obtuse Triangle Octagon A triangle that has at least one obtuse angle. Parallel lines two or more lines that have no points in common and never cross each other Parallelogram a quadrilateral with both pairs of opposite sides parallel Pentagon a five-sided polygon Perpendicular lines 2 segments, rays, or lines that form a 90 degree angle Point a zero-dimensional figure; while usually left undefined Polygon a shape that has 3 or more sides an eight-sided polygon . A Fifth Grade Geometry Vocabulary Protractor a tool used to measure angles Quadrilateral a four-sided polygon Ray a one-dimensional figure that consists of one endpoint Rectangle a quadrilateral whose angles are all right angles Regular Polygon a convex polygon whose angles and sides are all congruent Right angle an angle whose measure is 90 degrees Right triangle a triangle that has a 90 degree angle Rotational Symmetry Scalene triangle When the shape or image can be rotated and it still looks the same. a triangle with no equilateral sides Square an equilateral quadrilateral with 4 right angles Straight angle an angle whose measure is 180 degrees, forming a line with its sides Supplementary angles 2 angles whose measures, when added together, equal 180 degrees Symmetry line the line of reflection Tessellation A covering of a plane with congruent copies of the same region with no holes or overlaps Fifth Grade Geometry Vocabulary Transversal a line that intersects 2 others Trapezoid a quadrilateral that has at least one pair of parallel sides Triangle a polygon with three sides Vertex of an angle the common endpoint of the two rays Vertical angles 2 angles that share a common vertex and whose sides form 2 lines equilateral triangle, isosceles triangle, right triangle, scalene triangle