Geometric Shapes and Properties

Vocabulary flashcards covering the definitions and properties of various two-dimensional geometric shapes.

Circle

A perfectly round shape with one curved boundary and no corners, where every point on the edge is an equal distance from the center.

Ellipse (Oval)

An elongated, stretched-out round

Triangle

A closed shape with $3$ straight sides and $3$ vertices (corners).

Square

A $4$-sided regular shape with $4$ equal sides and $4$ right angles ($90^\circ$).

Rectangle

A $4$-sided shape with $4$ right angles where opposite sides are equal and parallel.

Parallelogram

A $4$-sided shape where opposite sides are parallel and equal in length, with equal opposite angles.

Rhombus

A slanted $4$-sided shape with $4$ equal sides (like a pushed-over square).

Trapezoid (Trapezium)

A $4$-sided shape with at least one pair of parallel sides.

Kite

A $4$-sided shape with two pairs of adjacent sides that are equal in length.

Pentagon

A flat shape with $5$ straight sides and $5$ vertices.

Hexagon

A flat shape with $6$ straight sides and $6$ vertices.

Heptagon (Septagon)

A flat shape with $7$ straight sides and $7$ vertices.

Octagon

A flat shape with $8$ straight sides and $8$ vertices.

Nonagon

A flat shape with $9$ straight sides and $9$ vertices.

Decagon

A flat shape with $10$ straight sides and $10$ vertices.

Dodecagon

A flat shape with $12$ straight sides and $12$ vertices.