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Geometry Vocabulary ReviewPowerPoint Presentation

Geometry Vocabulary Review

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### Geometry Vocabulary Review

Norton 4th Grade

Plane

- A flat surface that continues with out end in all directions

Dimension

- A measurement along a straight line of a length, height, or width of a figure

One dimensional

- A measure with only one direction such as length

Two dimensional

- A measure with 2 dimensions, such as, height and width

Angle

- Two lines or rays that share an endpoint

vertex

- The shared endpoint of two lines or rays

Acute angle

- An angle less than 90 degrees

Right angle

- A 90 degree angle

Obtuse angle

- An angle more than 90 degrees

Intersecting lines

- Lines that cross each other

Parallel lines

- Lines that never intersect and are the same distance apart

Perpendicular lines

- Lines that intersect at 90 degree angles

dimension

- A measurement along the straight line of a length, height or width of a figure

One dimensional

- A measure with only one direction such as length

Two dimensional

- A measure with 2 dimensions, such as, height and width

Three dimensional

- A measure with three dimensions, such as, height, width, and length

clockwise

Moving in a circular path to the right – like the hands on a clock

Counterclockwise

- Moving in a circular path to the left – opposite from a clock

diagonal

- A line that has a slope or angle

horizontal

- A flat line like the horizon, which is left to right

Line of symmetry

- A line that divides a figure in half so that the 2 halves can be folded on top of each other

reflection

- the movement of a figure to a new position by flipping the figure over

rotation

- The movement of a figure by rotating the figure around a point

transformation

- any movement of a figure (could be a translation, rotation or reflection)

translation

- Moves a figure to a new position by sliding it

symmetry

- Any shape that has symmetry has at least one line of symmetry

vertical

- A line that goes straight up and down

face

- Flat side of a figure

edge

- Where two faces meet on a 3-D figure

Vertex (vertices)

- Where three or more edges meet on a 3-D figure

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