What this lesson shows
Fixes a mistake
Upside down or long and thin, 3 sides and 3 vertices make a triangle.
The worked example
The lesson works this one step by step: triangle (question 1). Then your kid tries one like it on paper.
The steps
- Turned is still the same
- Count sides and vertices
- They decide the name
Helping at home
Count the sides and vertices, whatever way the shape is turned or stretched. Three and three is always a triangle.
If your kid gets stuck
Count its sides and corners.
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.
Standards
- Common Core 1.G.A.1
Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes.
Matches a standard in all 50 states and DCSee each state's code
- Alabama MA19.1.21a
- Alaska 1.G.1
- Arizona 1.G.A.1
- Arkansas 1.GM.1, 2.GM.2
- California 1.G.A.1
- Colorado 1.G.A.1
- Connecticut 1.G.A.1
- Delaware 1.G.A.1
- District of Columbia 1.G.A.1
- Florida MA.1.GR.1.1, MA.1.GR.1.2
- Georgia 1.GSR.4.1
- Hawaii 1.G.A.1
- Idaho 1.G.A.1
- Illinois 1.G.A.1
- Indiana 2.G.1, 1.G.1
- Iowa 1.G.A.1
- Kansas 1.G.1
- Kentucky KY.1.G.1
- Louisiana 1.G.A.1
- Maine 1.G.A.1
- Maryland 1.GR.B.3
- Massachusetts 1.G.A.1
- Michigan 1.G.A.1
- Minnesota 1.3.1.1
- Mississippi 1.G.1
- Missouri 1.GM.A.1, 1.GM.A.3
- Montana MT.1.G.1, MT.1.G.2
- Nebraska 1.G.1.a, 1.G.1.b, 2.G.1.a
- Nevada 1.G.A.1
- New Hampshire 1.G.A.1
- New Jersey 1.G.A.1
- New Mexico 1.G.A.1
- New York NY-1.G.1
- North Carolina NC.1.G.1.a, NC.1.G.1.b
- North Dakota 1.GM.G.1, 1.GM.G.2, 1.GM.G.3
- Ohio 1.G.1
- Oklahoma 1.GM.1.1, 1.GM.1.4, 3.GM.1.1
- Oregon 1.GM.A.1
- Pennsylvania CC.2.3.1.A.1
- Rhode Island 1.G.A.1
- South Carolina 1.MGSR.2.4, 1.MGSR.2.1, 1.MGSR.2.5, 1.MGSR.2.2
- South Dakota 1.G.A.1, 1.G.A.2
- Tennessee 1.G.A.1
- Texas 111.3.b.6.A, 111.3.b.6.B, 111.3.b.6.C, 111.3.b.6.D, 111.3.b.6.E, 111.4.b.8.B, 111.5.b.6.A
- Utah 1.G.1
- Vermont 1.G.A.1
- Virginia 1.MG.2a, 1.MG.2b, 1.MG.2c, 1.MG.2d, 2.MG.4a, 2.MG.4d, 4.MG.6a
- Washington 1.G.A.1
- West Virginia M.1.20
- Wisconsin M.1.G.A.1
- Wyoming 1.G.1