Naming flat shapes: 2nd grade math lesson

What this lesson shows

Triangle, square, rectangle, pentagon, hexagon, and octagon, drawn with a ruler. Count the sides and vertices.

The worked example

The lesson works this one step by step: pentagon (question 1). Then your kid tries one like it on paper.

The steps

Straight sides
A vertex is a corner
Count the sides to name it

Helping at home

Draw each side with a ruler so it is straight. Count the sides and the vertices: 3 is a triangle, 4 a square or rectangle, 5 a pentagon, 6 a hexagon, 8 an octagon.

If your kid gets stuck

Count the sides.

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 2.G.A.1
Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces. Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.

Matches standards in 50 statesSee each state's code

Alabama MA19.2.25a
Alaska 2.G.1
Arizona 2.G.A.1
Arkansas 2.GM.1
California 2.G.A.1
Colorado 2.G.A.1
Connecticut 2.G.A.1
Delaware 2.G.A.1
District of Columbia 2.G.A.1
Florida MA.2.GR.1.1, MA.2.GR.1.2
Georgia 2.GSR.7.1
Hawaii 2.G.A.1
Idaho 2.G.A.1
Illinois 2.G.A.1
Indiana 2.G.1
Iowa 2.G.A.1
Kansas 2.G.1
Kentucky KY.2.G.1, KY.3.G.1.a
Louisiana 2.G.A.1
Maine 2.G.A.1
Maryland 2.GR.B.5
Massachusetts 2.G.A.1
Michigan 2.G.A.1
Minnesota 2.3.1.1, 2.3.1.2, 3.3.1.2
Mississippi 2.G.1
Missouri 2.GM.A.1.a, 2.GM.A.1.b
Montana MT.2.G.1
Nebraska 2.G.1.b
Nevada 2.G.A.1
New Hampshire 2.G.A.1
New Jersey 2.G.A.1
New Mexico 2.G.A.1
New York NY-2.G.1, NY-3.G.1
North Carolina NC.2.G.1
North Dakota 1.GM.G.1, 2.GM.G.1, 2.GM.G.3
Ohio 2.G.1, 3.G.1
Oklahoma 2.GM.1.1, 2.GM.1.2, 2.GM.1.4, 3.GM.1.1
Oregon 2.GM.A.1
Pennsylvania CC.2.3.2.A.1
Rhode Island 2.G.A.1
South Carolina 2.MGSR.2.3, 2.MGSR.2.2
South Dakota 2.G.A.1
Tennessee 2.G.A.1, 3.G.A.3
Texas 111.4.b.8.A, 111.4.b.8.B, 111.4.b.8.C
Utah 2.G.1
Vermont 2.G.A.1
Virginia 2.MG.4a, 2.MG.4b, 2.MG.4c, 2.MG.4d, 3.MG.4a, 3.MG.4b, 3.MG.4c, 3.MG.4d, 3.MG.4e, 4.MG.6b
Washington 2.G.A.1
West Virginia M.2.25
Wisconsin M.2.G.A.1

Naming flat shapes