Naming quadrilaterals: 3rd grade math lesson

What this lesson shows

Parallelogram, rhombus, rectangle, square, trapezoid by their sides and corners.

The worked example

The lesson works this one step by step: a trapezoid, a parallelogram, a rectangle, a rhombus, a square. Then your kid tries one like it on paper.

The steps

4 sides, 4 corners
Parallel sides
Square corners
Equal sides

Helping at home

Count the sides first: 4 straight sides make a quadrilateral. Then look for parallel sides, test the corners with a paper corner, and measure the sides with a ruler. Name the shape by what you find.

If your kid gets stuck

Look for parallel sides first.

Watch it with Lux

With Lux, this lesson is a narrated video and a printed page your kid works on. Then Lux helps with the same math on their own worksheet, one question at a time.

See how Lux works

Standards

Common Core 3.G.A.1
Understand that shapes in different categories (e.g., rhombuses, rectangles, and others) may share attributes (e.g., having four sides), and that the shared attributes can define a larger category (e.g., quadrilaterals). Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.
Common Core 4.G.A.2
Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

Matches a standard in all 50 states and DCSee each state's code

Alabama MA19.3.26a, MA19.4.28a
Alaska 3.G.1, 4.G.2
Arizona 3.G.A.1, 4.G.A.2
Arkansas 3.GM.1, 3.GM.3, 4.GM.5
California 3.G.A.1, 4.G.A.2
Colorado 3.G.A.1, 4.G.A.2
Connecticut 3.G.A.1, 4.G.A.2
Delaware 3.G.A.1, 4.G.A.2
District of Columbia 3.G.A.1, 4.G.A.2
Florida MA.3.GR.1.2
Georgia 3.GSR.6.2, 4.GSR.8.2
Hawaii 3.G.A.1, 4.G.A.2
Idaho 3.G.A.1, 4.G.A.2
Illinois 3.G.A.1, 4.G.A.2
Indiana 4.G.1, 3.G.1, 5.G.1, 4.G.3
Iowa 3.G.A.1, 4.G.A.2
Kansas 3.G.1, 4.G.2
Kentucky KY.3.G.1.b, KY.3.G.1.c, KY.4.G.2
Louisiana 3.G.A.1, 4.G.A.2
Maine 3.G.A.1, 4.G.A.2
Maryland 3.GR.B.5, 4.GR.C.9, 5.GR.B.3.a
Massachusetts 3.G.A.1, 4.G.A.2
Michigan 3.G.A.1, 4.G.A.2
Minnesota 4.3.1.2, 4.3.1.1
Mississippi 3.G.1, 4.G.2
Missouri 3.GM.A.1, 3.GM.A.2, 4.GM.A.2
Montana MT.3.G.1, MT.4.G.2, 4.D1.23, 5.D1.4
Nebraska 3.G.1.1, 4.G.1.c
Nevada 3.G.A.1, 4.G.A.2
New Hampshire 3.G.A.1, 4.G.A.2
New Jersey 3.G.A.1, 4.G.A.2
New Mexico 3.G.A.1, 4.G.A.2
New York NY-3.G.1, NY-4.G.2.b, NY-4.G.2.c, NY-4.G.2.a
North Carolina NC.3.G.1.a, NC.3.G.1.b, NC.4.G.2
North Dakota 3.GM.G.2, 4.GM.G.2
Ohio 3.G.1, 4.G.2, 5.G.3
Oklahoma 4.GM.1.2
Oregon 3.GM.A.1, 4.GM.A.2
Pennsylvania CC.2.3.3.A.1, CC.2.3.4.A.2
Rhode Island 3.G.A.1, 4.G.A.2
South Carolina 4.MGSR.3.1
South Dakota 3.G.A.1, 4.G.A.2
Tennessee 3.G.A.1, 4.G.A.2
Texas 111.5.b.6.A, 111.5.b.6.B, 111.6.b.6.C, 111.6.b.6.D
Utah 3.G.1, 4.G.2
Vermont 3.G.A.1, 4.G.A.2
Virginia 4.MG.5a, 4.MG.5d.i, 4.MG.5d.ii, 4.MG.5d.iii, 4.MG.5d.iv, 4.MG.5c, 4.MG.5e, 5.MG.3b
Washington 3.G.A.1, 4.G.A.2
West Virginia M.3.26, M.4.27
Wisconsin M.3.G.A.1, M.4.G.A.2
Wyoming 3.G.1, 4.G.2

Naming quadrilaterals