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 TOPICS This page:   triangles/polygons    Search   Dr. Math See also the Dr. Math FAQ:   geometric formulas and   naming polygons   and polyhedra and   Pythagorean theorem Internet Library:   triangles/polygons ELEMENTARY Arithmetic    addition    subtraction    multiplication    division    fractions/decimals Definitions Geometry    2-dimensional      circles      triangles/polygons    3D and higher      polyhedra Golden Ratio/ Fibonacci Sequence History/Biography Measurement    calendars/      dates/time    temperature    terms/units Number Sense/ About Numbers    infinity    large numbers    place value    prime numbers    square roots Projects Puzzles Word Problems Browse Elementary Triangles and Other Polygons Stars indicate particularly interesting answers or good places to begin browsing. 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? Rectangles and Areas [09/30/1998] How do you find the area of a square or rectangle? What if the shape looks like several rectangles put together? Regular Decagon [03/25/2002] Can you show me a picture of a regular decagon? Teaching Area of Triangles [9/15/1996] When I gave a Unit Assessment, all but one student got area of a triangle wrong. Where did I fail? Triangles with Specific Lengths and Angles [3/24/1996] My base is 32 inches and my angle can not exceed 35 degrees. How long will my sides be and what is the inside angle? Types of Triangles [02/24/2003] What is the the difference between equilateral, isosceles, and scalene triangles? How can I remember which name goes with which triangle? Using a Parallelogram to find the Area of a Triangle [06/26/2001] What is the area of a triangle with a height of 12 inches and a base of 3 inches? Using a Protractor [06/28/1998] How do you construct two parallel lines and intersect them making a 65-degree angle? What is a Vertex? [12/06/2001] And what does vertices mean? What is Circumference? [06/25/2001] My friend told me it's somewhat like the measurement of the outside of a circle, but I don't understand that. What is Length in a Rectangle? [05/31/1999] Is the length of a rectangle the longest side, whether vertical or horizontal? What is the Largest Sided Polygon? [4/12/1995] What is the largest sided polygon? What is the Plural of Rhombus? [4/7/1995] Hi! Say, what exactly is the plural of "rhombus?" We aren't sure if it is "rhombi" or "rhombuses". Page: [

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