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# Geometry Terms

### Geometry Terms for 5th grade

TermMeaning
obtuse angle angle that is greater than 90 degrees and less than 180 degrees
acute angle angle less than 90 degrees but greater than 0.
straight angle angle that is 180 degrees
congruent figure that has the same size and shape
line segment part of a line drawing having two end points
point exact location in space
ray part of a line that has one end point and extends forever in only one direction
line a set of points that goes on forever in two directions
plane an endless flat surface
parallel line in a plane, lines that never cross and are the same distance apart.
intersecting lines lines that pass through the same point
perpendicular lines two lines that intersect to form right angles
turn the change in the position of a figure that moves around a point.
prism a solid figure with two congruent parallel bases and faces that are parallelograms
base The face of a solid that is used to name a solid.
cube A solid figure with all faces are squares
face A flat surface of a polyhedron
transformation A move such as a slide, flip, or turn that does not change the size or shape of a figure
angle two rays that have the same end point
vertex the common endpoint of an angle
sides the two rays that form the angle
right angle An angle whose measure is 90 degrees
protractor An instrument used to measure and draw angles.
similar figures that have the same shape. They may or may not be the same size.
sphere A solid figure with all points the same distance from center point
cylinders solid with two circular bases that are congruent and parallel
cone a solid with one circular base
chord A line segment that connects two points on a circle
slide The change in position of a figure that moves it up, down, or sideways
triangle a polygon with 3 sides
quadrilateral a polygon with 4 sides
pentagon a polygon with 5 sides
hexagon a polygon with six sides
octagon a polygon with 8 sides
right triangle a triangle with one right angle
acute triangle a triangle with 3 acute angles
obtuse triangle a triangle with 1 obtuse angle.
line of symmetry the fold line in a symmetric figure
edge a line segment where two faces meet.
rectangle a parallelogram with four right angles
pyramid a solid figure with all faces being triangles.
radius Any line segment that connects the center of a circle to a point on a circle.
flip The change in the position of a figure that gives the mirror image of the figure.
equilateral triangle a triangle whose sides all have the same length.
isosceles triangle a triangle with two sides the same length
scalene triangle a triangle with no sides having equal lengths
parallelogram a quadrilateral with both pairs of opposite sides being parallel
rhombus a parallelogram with all sides the same length
trapezoid a quadrilateral that has exactly one pair of parallel sides
diameter any line segment that goes through the center of a circle and both endpoints are on the circle.