Friday, April 29, 2011

Trigonometry

1. Define/Describe trigonometry (2 pts)
A Math dealing with relationship between angles and sides of a triangle
 Citations- Google definitions
2. Describe some of the early uses. Why was it invented? (3 pts)
First used for navigation and astronomy.  Used to solve triangle problems.

Citations- Google timeline
3. Describe a current use of trigonometry. (3 pts)
Finding distance of stars and measuring distances and heights. Aslo used in architecture and engineering. 

Citations- Google timeline, Wikipedia
4. Find the height of two objects outside. Explain your work. (5 pts)
pole-  tan63=x/7       7tan63=x     x= 19        13.7+5.3(length from eyes down)= 19      Pole=19 feet tall
shop building- tan50=x/10       10tan50=x   x=11.9   11.9+5.3=17.2    Shop building= 17.2 feet tall