20. Quadrilaterals & other polygons
A closed shape with only straight edges is called a polygon. A polygon with all sides and all angles equal is called regular.
A polygon with 4 sides is called a quadrilateral. A regular polygon with 4 sides is called a square.
A quadrilateral with four right angles but just opposite parallel sides of equal length, is called a rectangle.
The area of a square of side x=$x^2$ sq. units. Perimeter=$4*x$ units.
Area of a rectangle with adjacent sides a and b=$ab$ sq. units. Perimeter=$2*(a+b)$ units.

The above graphic illustrates how to compute the total interior angle measure of a polygon, and the measure of each angle if it is regular.

 


By continuing to use this website, you acknowledge that this service is provided as is, with no warranty of any kind whatsoever.
Copyright 2015 ChiPrime. All rights reserved.