When it comes to strength, the shape of a structure and its individual parts is often as important as the material the structure is made of. This interactive activity from the Building Big Web site describes some of the properties of three different shapes -- the rectangle, triangle, and arch -- and explains why some shapes resist forces better than others.
This resource can be found on the Building Big Web site.
© 2015 PBS & WGBH Educational Foundation. All rights reserved.