Lego Geometry 101: Studs, Bricks, and Plates
The LEGO system is based upon some very simple rules. The following illustrations will cover all of the basic building elements and their dimensional relationships with each other.
Geometry analysis: Technic angular beam 3x7 (42160)
When creating novel designs with LEGO, it is helpful to understand the precise geometry so that we don’t use parts incorrectly and damage them. The Technic Angular Beam 3x7 (ID: 42160) is also known on Bricklink as the Technic, Liftarm, Modified Bent Thick 1 x 9 (7 - 3) (Item 32271). First introduced in 1999, this is a fairly common element in Technic builds and is currently available in 7 colors.
Geometry analysis: Technic angular beam 4x6 (42149)
When creating novel designs with LEGO, it is helpful to understand the precise geometry so that we don’t use parts incorrectly and damage them. The Technic Angular Beam 4x6 (ID: 42149) is also known on Bricklink as the Technic, Liftarm, Modified Bent Thick 1 x 9 (6 - 4) (Item 6629). First introduced in 1996, this is a fairly common element in Technic builds and is currently available in 10 colors.