This document discusses angles and properties of angles using examples from nature. It explains that the sum of the measures of the two angles formed by a straight line and a transversal is 180 degrees. It also notes that a tree trunk growing at a 90 degree angle from the ground forms a right angle, and that the angles on either side of this are equal since they are vertical angles.

1. By Edward Wroten and Olivia Major

2. This is a Tree that has grown a right angle trunk

4. 1 2 Angle one plus angle two equals 180 degrees

5. Ray BD Bisects line ABC into to angle ABD and angle DBC

6. Angle one is a acute angle because the degree is less then 90

7. Angle one and two are vertical angles because the both share a vertex and are equal and are the same angle, but are not adjacent because they do not share slides

8. Points A and B create a strait line

9. The tree trunk and the ground create a 90 degree angle and the bush between them creates anther angle . So if you add angle one and two together you will get 90

10. Suzanne. &quot;Angles of Man, Angles of Nature.&quot; 1 Oct. 2008 <http://lh5.ggpht.com/_kk2bk3pknoi/rkpgcfyztri/aaaaaaaabxy/vbrvjm41ohq/image31.jpg>. &quot;Right Angle Tree on the Way to Munnar.&quot; Farm4.static.flickr . 24 May 2008. 1 Oct. 2008 <http://farm4.static.flickr.com/3066/2357618492_02dbe00a31_m.jpg>. &quot;Ladder tree.&quot; Arbosmith . 1 Oct. 2008 <http://www.arborsmith.com/images/ladder_tree1.jpg>. Delivery . 1 Oct. 2008 <http://wwwdelivery.superstock.com/wi/223/1796/previewcomp/superstock_1796r-8217.jpg>. &quot;Leaf.&quot; Domino Research . 1 Oct. 2008 <http://domino.research.ibm.com/comm/research_teams.nsf/pages/zos.index.html/$file/leaf_1_bg_010503.jpg>. &quot;Tree Northumberland.&quot; Freefoto . 1 Oct. 2008 <http://www.freefoto.com/images/15/19/15_19_8---tree--northumberland_web.jpg>.