http://www.ck12.org Chapter 11. Surface Area and Volume
11.2 Cross-Sections and Nets
Here you’ll learn how to view three-dimensional figures in a two-dimensional plane using cross-sections and nets.
What if you wanted to expand your thinking of geometric shapes beyond the flat two-dimensional ones to three
dimensional (3D) ones? In this chapter we are going to expand to 3D. Copy the equilateral triangle to the right onto
a piece of paper and cut it out. Fold on the dotted lines. What shape do these four equilateral triangles make? If
we place two of these equilateral triangles next to each other (like in the far right) what shape do these 8 equilateral
triangles make? After completing this Concept, you’ll be able to answer questions like these.
Watch This
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/52638CK-12 Foundation: Chapter11CrossSectionsandNetsA
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/10340