## Glossary of Feb. 4

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- cubic unit
- a cube with edges that are 1 unit long

- volume
- the number of cubic units needed to fill a solid figure

- square unit
- a square with sides that are each 1 unit long

- area
- the number of square units needed to cover the region inside a figure

- perimeter
- the distance around a figure

- peri
- around

- meter
- measure

- symmetric
- your figure is symmetric because the two halves of the figure match

- line of symmetry
- the fold line is the line of symmetry

- flip
- a flip of a figure gives its a mirror image

- congruent
- two figures are congruent if they have the same size and shape

- rectangle
- four right angles and opposite sides are the same length

- square
- four right angles and all sides are the same length

- parallelogram
- Opposite sides are parallel and all sides are the same length

- rhombus
- opposite sides are parallel and all sides are the same length

- trapezoid
- there is only one pair of parallel sides

- polygon
- a closed figure made up of parallel sides

- side
- EACH LINE SEGMENT ON A POLYGON IS A SIDE

- equilateral triangle
- all sides are the same length

- isosceles triangle
- at least two sides are the same length

- scalene triangle
- no sides are the same length

- right triangle
- one angle is a right angle

- acute triangle
- all three sides are acute angles

- obtuse triangle
- one angle is an obtuse angle

- angle
- an angle is made by two rays that have the same end point.