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Geometry Terms

Geometry Terms for 5th grade

TermMeaning
volume amount of space inside a 3 dimensional figure
right triangle a triangle with 1 right angle and 2 acute angles
isosceles triangle a triangle with at least two congruent sides
edge line segment where 2 faces of a 3D figure meet
net a 2 dimensional pattern of a 3D figure
prism a 3D figure with 2 parallel, congruent faces, called bases; at least 3 faces are rectangles
acute triangle a triangle with 3 acute angles
congruent figures two figures that have the same size & shape
cubic unit the unite of measure for volume
face a flat surface
rectangular prism a closed figure made up of line segments that DO NOT CROSS
net a parallelogram with 4 congruent sides
triangle prism a prism that has triangular bases
vertex the point where 3 or more faces meet on a 3D figure
bases two parallel congruent faces in a prism
cube a 3D figure with 6 faces that are congruent squares
attribute a characteristic of a figure
regular polygon a polygon with all sides & anges are congruent
trapezoid a quadrilateral with exactly 1 pair of opposite sides
square a parallelogram with 4 congruent sides and 4 right angles
equilateral triangle a triangle with 3 congruent sides
parallelogram a quadrilateral with both pairs of opposite sides being parallel
congruent angles angles of a figure that are equal in measure
scalene triangle a triangle with NO congruent sides
3 D figure a figure that has length, width and height
rectangular prism a prism that has rectangular bases
rectangle a quadrilateral with 4 right angles; opposite sides are equal & parallel
unit cube a cube with a side length of one unit
composite figure a figure that is made up of two or more 3D figures
hexagon a polygon with 6 sides & 6 angles
obtuse triangle a triangle with 1 obtuse angle & 2 acute angles
congruent sides sides of a figure that are equal in length
octagon a polygon with 8 sides
pentagon polygon with 5 sides
rhombus a parallelogram with 4 congruent sides
Created by: JohnW