The Math Forum

Ask Dr. Math

Elementary Archive

Dr. Math Home || Elementary || Middle School || High School || College || Dr. Math FAQ

This page:
  3D and higher
  geometry checkmark

  Dr. Math

See also the
Dr. Math FAQ:
  geometric formulas
  naming polygons
  and polyhedra

Internet Library:




   3D and higher

Golden Ratio/
Fibonacci Sequence



Number Sense/
About Numbers
   large numbers
   place value
   prime numbers
   square roots

Word Problems

Browse Elementary 3D and Higher Geometry
Stars indicate particularly interesting answers or good places to begin browsing.

Selected answers to common questions:
    Do cones or cylinders have edges?

Area and Volume [04/10/2002]
I cannot figure out how to do volume.

Bases and Faces [12/05/2001]
I can't figure out the difference between a base and a face on the shapes we are learning.

Cutting a Cake into 8 Pieces with 3 Cuts [09/08/2002]
How do you cut a cake into 8 pieces making only 3 cuts? How do you cut a doughnut into 12 pieces with only 3 cuts?

Cylinders and Elephants [05/30/1997]
Why are cans always manufactured as cylinders? Are the volume of an animal and the surface area of its feet related?

Defining a Sphere [12/1/1994]
We have two math textbooks from different years that give different information about spheres. One says a sphere has one curved face and the other says it has zero. Is one right and the other wrong or has the definition changed?

A Definition of Geometry [2/1/1996]
A fifth grader asks Dr. Math to give her a definition of geometry.

Definitions of Cones and Cylinders [03/02/2004]
Are cones and cylinders pyramids, prisms or neither? My 5th grade geometry class cannot reach an agreement on this subject!

Distance Between Opposite Corners of a Box [05/09/2002]
A moth is sitting in the lower left front corner of a storage shed. What is the length of the shortest path that the moth can fly to the upper right back corner of the shed?

Does a Sphere have Sides? [04/20/2001]
How many sides does a sphere have?

Edge of a Cube Given Volume [10/06/1997]
I am a teacher currently teaching volume to a class of Grade 5 pupils.

Edges vs. Corners [04/18/2002]
My students get confused on how to determine an edge versus a corner, and counting the number of edges on a geometric figure, say a cube.

Fourth Grade Geometry Questions [4/24/1995]
My grade 4 regular education students are wondering if curved lines can be parallel lines.

Geometric Objects [4/1/1996]
Name objects in the real world that suggest geometric figures, including lines and planes.

Is a Sheet of Paper a 2D or 3D Object? [05/17/2008]
Our teacher said that a piece of paper is a two-dimensional object that has no height, but some of my classmates and I disagree. We think a piece of paper still has a height, even if it is very, very, small, and that it is therefore a three-dimensional object. Who's right?

Length or Width? [12/02/2003]
Can you please explain the difference between height, length, width and depth? Is it always the same for each thing?

Mobius Strips, Spheres, and Dimensionality [05/28/2003]
Is a Mobius Strip 2-D or 3-D? Or is it 1-D? What about a sphere?

Relative Motion on Face of Earth [05/06/2007]
If I am traveling along the earth's surface at the same rate of speed that the earth is rotating in the opposite direction then would I appear to not be moving if you watched me from space?

Surface Area of a Box [03/06/2003]
How do you find the surface area of a box?

What is a Torus? [11/30/1999]
Is there a good way to describe a torus to a child?

What is Geometry For? [03/01/2002]
What is geometry really for?

Page:  1

Search the Dr. Math Library:

Search: entire archive just Elementary Three-Dimensional Geometry

Find items containing (put spaces between keywords):
Click only once for faster results:

[ Choose "whole words" when searching for a word like age.]

all keywords, in any order at least one, that exact phrase
parts of words whole words

[Privacy Policy] [Terms of Use]

Home || The Math Library || Quick Reference || Search || Help 

© 1994- The Math Forum at NCTM. All rights reserved.