See also the
3D and higher
Browse Middle School Definitions
Stars indicate particularly interesting answers or
good places to begin browsing.
- Pentagram [12/08/2001]
Is a five-pointed star on a flag a decagon? Or just five triangles?
- Percent Greater Than vs. Increased [11/22/2002]
Is there a difference between the following statements? My profits are
200% greater than they were last year; My profits from last year have
- Percent Increase and "Increase by a Factor of ..." [08/01/2006]
If we start with 1 apple today and tomorrow have 2 apples, then we have
a 100 percent increase. But can't I also say there was an increase by a
factor of 2?
- Perfect Numbers [08/14/1997]
What is the highest perfect number that has been found? How many perfect
numbers are there? What are they?
- Perfect Square: Definition [10/24/1999]
What is a perfect square?
- Perimeter of an Oval [04/08/1999]
What is the perimeter of an oval called?
- pH Definition [10/20/2001]
What is the 'p' in pH?
- Phi [05/18/1997]
What is phi?
- Point Symmetry [08/19/2001]
What exactly is point symmetry? How can one tell if point symmetry is
- Polygon Names [09/18/2001]
Why is a 3-sided polygon called a triangle instead of a tri-gon? Why is a
4-sided polygon called a quadrilateral instead of a tetragon, when all
the others are ___-gons? Why is there not a single consistent term?
- Polyhedra: Classification, Theorem [02/12/1998]
I would like to know how polyhedrons are classified, which figures can be
used for the faces, and the theorem relating the faces, edges, and
- Polyominoes [09/08/1997]
I am using polyominos, but I do not know how to tell my dad what they
are. How can I tell him so he will know?
- Polyominos [08/11/1999]
What is the definition of a polyomino?
- The Pound Sign [04/06/2001]
Can the # symbol be used to represent the weight unit 'pounds'?
- Power or Exponent? [10/14/2003]
I always thought that 'power' was just a synonym for 'exponent'. Is
- Prime Numbers [01/31/1997]
What are the prime numbers and why are they prime numbers?
- Prime Numbers vs. Prime Factors [01/13/1997]
What is the difference between a prime number and a prime factor?
- Principal Square Root Positive [10/24/2002]
Why are we always taught that the principal square root of a number is
- Profit Margin and Percentage Markup [02/16/2007]
I own a small business and am a little confused about the difference
between a percentage markup and a profit margin. Are they the same
thing? If not, how are they different?
- Pronumerals [05/14/2002]
What is a 'pronumeral'?
- Pronunciation of Fractions [03/28/1997]
How do you pronounce fractions with 32, 42... in the denominator...?
- Proofs with Isosceles Triangles [10/28/1998]
What are altitudes, angle bisectors, and medians? How do you prove that
in an isoseles triangle, the altitude is a median and an angle bisector?
- Proportionality Symbol [05/20/2003]
Do you know the name of the little symbol used in the topic of rates
and variation that means 'in proportion to'?
- Pyramid Corners [05/01/2001]
How many corners does a pyramid have? Is a corner the same thing as a
- Pyramids and Triangular Prisms [05/09/2000]
What's the difference between a pyramid and a triangular prism?
- Quadrant [03/25/2001]
What is a quadrant?
- Quadratic Equation [7/10/1996]
Why is a quadratic equation "quadratic"?
- Quadratic Equations [12/3/1995]
My students want to know why an equation of the second degree is referred
to as a quadratic equation. What does the prefix quad have to do with
second degree equations?
- Quadrilateral Classification: Definition of a Trapezoid [01/15/1997]
What is the correct definition of a trapezoid, and why?
- Quadrilaterals [8/31/1995]
What is 4-sided and has no equal angles?
- Range, Mean, Median, and Mode [11/17/1998]
Why do we study range, mean, median, and mode? How will these concepts
help me in real life?
- Ray, Line Segment, Line [08/23/1997]
I need to know definitions for ray, line segment, and line.
- Rays and Angles [11/24/1997]
Do rays have an arrow on both ends, or is that an angle?
- Reciprocals [12/19/1996]
What is the use of reciprocals?
- Rectangular Prism [9/10/1995]
What is the term for a 3-dimensional rectangle, i.e., box?
- Reflecting a Triangle [9/14/1996]
A right triangle is reflected about its hypotenuse. What is the new
geometric figure that is formed?
- Reflex Angle [11/30/1998]
What is a reflex angle?
- Regression Method [11/18/1997]
What is the regression method?
- Regular Decagon [03/25/2002]
Can you show me a picture of a regular decagon?
- Regular vs. Equilateral Polygons [07/24/2003]
What is the difference between a regular polygon and an equilateral