Archive for May, 2010
Math Worksheets Lattice
May 12th, 2010
Multiplying decimals with the lattice method
Posted in Math Worksheets | 
Tags: free, games, math, math worksheets lattice, resources, worksheets | 
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Polygons
May 8th, 2010
Polygons in Geometry
Polygons in Geometry are numerous. In Geometry, the number of sides of polygons and the sum of interior angles of the polygons are important.
What is a polygon?
A polygon is a term used to describe triangles, trapezoids, pentagons, hexagons and octagons. A polygon is any shape with at least three sides. A Triangle is the smallest polygon.
Types of polygons, polygon shapes and polygon names
Polygon names – polygons |
number of sides |
sum of interior angles of polygons (in degrees) |
| Triangle | 3 | 180 |
| quadrilateral | 4 | 360 |
| square | 4 equal and perpendicular | 360 |
| rectangle | 4 perpendicular | 360 |
| rhombus | 4 equal | 360 |
| parallelogram | 4 opposite parallel | 360 |
| pentagon | 5 | 900 |
| hexagon | 6 | 1080 |
| heptgon | 7 | 1260 |
| octagon | 8 | 1440 |
| nonagon | 9 | 1620 |
| decagon | 10 | 1800 |
| ondecagon or hendecagon | 11 | 1980 |
| dodecagon | 12 | 2160 |
| icosagon | 20 | 3600 |