# Grade 6 - Unit 5: Area and Volume

## 32 terms

### 2-Dimensional

A shape that only has two dimensions (such as width and height) and no thickness.

### 3-Dimensional

An object that has height, width and depth (thickness), like any object in the real world.

### Area

The number of square units it takes to completely fill a space or surface.

### Bases of a Prism

The two faces formed by congruent polygons that lie in parallel planes, all of the other faces being parallelograms.

### Cubic Units

Volume of the solids is measured in cubic units.

### Edge

The intersection of a pair of faces in a three-dimensional figure.

### Equilateral Triangle

A triangle which has all three of its sides equal in length.

### Face

One of the polygons that makes up a polyhedron.

### Fractional edge length

The length of each edge of the cube is a fraction.

### Isosceles Triangle

A triangle which has two of its sides equal in length.

### Kite

A quadrilateral with two distinct pairs of equal adjacent sides. A kite-shaped figure.

### Lateral Faces

In a prism, a face that is not a base of the figure.

### Net

A two-dimensional figure that, when folded, forms the surfaces of a three-dimensional object.

### Parallelogram

A quadrilateral with both pairs of opposite sides parallel.

### Polygon

A number of coplanar line segments, each connected end to end to form a closed shape. A regular polygon has all sides equal and all interior angles equal. An irregular polygon sides are not all the same length nor does the interior angles have the same measure.

### Polyhedron

A 3-dimensional figure that has polygons as faces.

### Prism

A polyhedron with two parallel and congruent faces, called bases, and all other faces that are parallelograms.

Four coplanar line segments linked end to end to form a closed figure. A 4-sided polygon.

### Rectangle

A 4-sided polygon where all interior angles are 90 degrees.

### Rectangular Prism

A solid (3-dimensional) object which has six faces that are rectangles.

### Rhombus

A quadrilateral with all four sides equal in length.

### Right Triangle

A triangle where one of its interior angles is a right angle (90 degrees).

### Right Rectangular Prism

In a right prism, the lateral faces are each perpendicular to the bases.

### Scalene Triangle

A triangle where all three sides are different in length.

### Square

A quadrilateral that has four right angles and four equal sides.

### Surface Area

The total area of the 2-dimensional surfaces that make up a 3-dimensional object.

### Trapezoid

A quadrilateral which has one pair of parallel sides.

### Triangles

A closed figure consisting of three line segments linked end-to-end.

### Triangular Prism

A prism whose bases are triangles. A solid (3-dimensional object) that has five faces: three rectangles and two bases.

### Vertices

The common endpoint of two or more rays or line segments.

### Volume

The amount of space occupied by an object.

### Volume of a Prism

The area of a base times the height. The number of cubic units to fill a prism.