Geometry Angles Post 1

Things You Need to Know

In this topic there are several things/facts/names that you need (memorise).  Most are very common words (like square etc) but some are a little harder to remember. 
 
Here are the first ones (and some tricks to help you recall them)...

                            The Polygons...

The ones people struggle with and ways to remember them...
+ Pentagon (FBI headquarters see below*).
+ Hexagon (hex and six both have x's in them).
+ Heptagon (the French word for seven is sept).
+ Nonagon (nona and nine both have n's in them).



 
The Types of Triangles...

• Right Angle - has a 90 degree corner.
• Isosceles - has two sides the same length.
• Equalateral - has three sides the same length.
• Scalene - has no sides the same length.

[you can have mixtures of some of these]


Last Thing - Regular.  A regular polygon is when all the sides (and angles) are the same.   Here is a picture of three pentagons but only one is regular.  Usually we mark the same lengths with dashes.

Here is a picture of the FBI head quarters "The Pentagon".