Square

A quadrilateral with 4 equal sides and 4 vertices that form right angles.

Opposite sides are parallel.

Opposite sides are parallel.

Rectangle

A quadrilateral with 4 sides and 4 vertices that form right angles.

Opposite sides are equal and parallel.

Opposite sides are equal and parallel.

Triangle

A polygon with 3 sides and 3 vertices.

Circle

A plane shape made with a continuous line which is always the same distance from the center. It has no sides and no vertices.

Line

A straight path that goes without end in opposite directions.

Line Segment

Part of a line with two end points.

Right Angle

A 90 degree angle that makes a square corner.

Side

Line segments of a polygon.

Vertex

The point where two sides meet.

Quadrilateral

Any polygon with 4 sides and 4 angles.

Parallelogram

Any quadrilateral with opposite parallel sides. Example: rectangle, rhombus, square

Trapezoid

A quadrilateral with one pair of parallel sides.

Rhombus

A parallelogram with four equal sides and equal opposite angles.

Congruent

A plane figure with the same size and shape.

Symmetry

A plane figure that can be folded along a line so the two parts match.

Line of Symmetry

The line that divides two matching parts. It can be vertical, horizontal, or diagonal.

Perimeter

The distance around the figure.

Area

The size a surface takes up, measured in square units.

Rectangular Prism

A solid shape that has: 6 faces (4 rectangles & 2 squares), 8 vertices, and 12 edges.

Cube

A solid shape that has: 6 square faces all equal in size, 8 vertices, and 12 equal edges.

Sphere

A solid shape that is perfectly round like a ball. No faces, edges, or vertices.

Cone

A solid shape with a circular base, 1 curved edge, and a curved surface that comes to a point (vertex or apex).

Cylinder

A solid shape with one curved surface, 2 curved edges and two circular bases.

Pyramid

A solid shape with a polygon as a base and triangular faces that come to a point (vertex or apex)

Face

The flat surface of a 3D shape.

Edge

Where two faces meet (intersect).

Plane shape

A flat closed shape having only 2 dimensions.

Parallel Lines

Lines that do not cross (intersect) and are always the same distance apart.