The town of Stanley appears in the following GeoGebra Applet as an image from Google Maps. To estimate the area of Stanley on our scaled map, [br][br]*The scale factor is 1 grid unit = 600 ft or 1 grid unit[math]^2[/math]=0.0129 miles[math]^2[/math][br][br][br]a.) Plot the three points (14,10) , (11,4) and (3,8). [br]b.) Use the method described in section 8.5 to find the area of the triangle created by the three vertices (using the determinant of the three by three matrix).[br][br]c.) Use the polygon tool [icon]https://www.geogebra.org/images/ggb/toolbar/mode_polygon.png[/icon] to draw the triangle created by points C, D and E.[br]d.) Type in area[C,D,E] or area[poly1] to have GeoGebra calculate the area of the region.

Codes are used in many areas of life some personal and some cooperative This section focuses on the use of decoding matrices.  Research the peculiar life of Alan Turing.

According to Wikipedia, [b]Cryptography[/b] or [b]cryptology[/b]; is the practice and study of techniques for [url=https://en.wikipedia.org/wiki/Secure_communication]secure communication[/url] in the presence of third parties called [url=https://en.wikipedia.org/wiki/Adversary_(cryptography)]adversaries[/url]. Cryptography prior to the modern age was effectively synonymous with [i][url=https://en.wikipedia.org/wiki/Encryption]encryption[/url][/i], the conversion of information from a readable state to apparent [url=https://en.wikipedia.org/wiki/Nonsense]nonsense[/url]. The originator of an encrypted message (Alice) shared the decoding technique needed to recover the original information only with intended recipients (Bob), thereby precluding unwanted persons (Eve) from doing the same. Since [url=https://en.wikipedia.org/wiki/World_War_I]World War I[/url] and the advent of the [url=https://en.wikipedia.org/wiki/Computer]computer[/url], the methods used to carry out cryptology have become increasingly complex and its application more widespread.[br][br]Use [url=http://www.minmm.com/minc/secretcode.php]this site[/url] to try out some other ciphers (other than matrices).[br]