Texas Essential Knowledge and Skills (TEKS):
3.6.A

classify and sort two- and three-dimensional figures, including cones, cylinders, spheres, triangular and rectangular prisms, and cubes, based on attributes using formal geometric language;

Texas Essential Knowledge and Skills (TEKS):
3.6.B

use attributes to recognize rhombuses, parallelograms, trapezoids, rectangles, and squares as examples of quadrilaterals and draw examples of quadrilaterals that do not belong to any of these subcategories;

3rd Grade Math - Two- & Three-Dimensional Figures Lesson

A quadrilateral is a 4-sided figure.

trapezoid

parallelogram

rectangle

square

rhombus

A two-dimensional figure is a figure without thickness; it is flat.

A polygon is a two-dimensional figure made up of non-overlapping, straight line segments.

The point where two line segments meet is a vertex.