Vertical Angles

The rotors of this helicopter are an example of vertical angles. Vertical angles are formed by a pair of non-adjacent angles that are formed by the intersection of two straight lines. The rotors are two straight lines that are non-adjacent and intersect. Helicopters are used for air transportation, and are specific to the aerospace industry.

I found this picture online at http://visual.merriam-webster.com/transport-machinery/air-transport/examples-helicopters/ambulance-helicopter.php

Obtuse Angle

This is an oil rig that represents an obtuse angle. An obtuse angle is any angle greater than 90 degrees/right angle and the underlined piece is greater than 90 degrees.This oil rig is used to extract and collect oil from the sea and is specific to the oil industry.

I found this image online at  http://www.politico.com/blogs/jonathanmartin/0808/McCain_finally_gets_to_oil_rig.html

Three Coplanar Parallel Lines

This brick wall shows three parallel lines that are in the same plane, so they are coplanar. All three lines, if they were to go on forever would never intersect/touch so they are parallel. Brick walls are everywhere in the world and this particular one is the side of my house. Walls are the fundamental object of builders and they are extremely common for building houses, schools, hospitals, etc. This wall, technically, could be specific to the security industry. The definition of security from http://en.wikipedia.org/wiki/Security states the word is the degree of protection to safeguard a nation, union of nations, persons or person against danger, damage, loss, and crime. This wall, and the other walls that make my house protect my family and I from danger, damage, loss and crime.

I took this picture myself.