Congruent acute or obtuse angles

Angles are congruent if they have the same angle measure in degrees. These scissors contain congruent acute angles (drawn on in purple). They are acute because they both have measurements less than 90 degrees. The angle at which the scissors open both have the same dimensions and shape, making them congruent. Scissors are a househeld object and are used to cut things. I took this photo myself and scissors are part of the metal fabrication industry.  

Line perpendicular to a plane

A line is perpendicular to a plane if and only if the line intersects the plane in a point and is perpendicular to every line in the plane that intersects it at that point. This picture shows a pencil intersecting an advertisement. The red line (pencil) intersects the blue plane (the advertisement) because it goes through the plane and is a right angle to another line in that plane. The ad was found in a magazine and the pencil was found in my backpack. The ad relates to the real world because it is how companies broadcast their ideas to the general public. I took this picture on my own camera. This picture portrays the marketing industry because of the pencil intersecting the advertisement.

Three or more coplanar parallel lines

Coplanar lines are lines lying in the same plane. This keyboard contains multiple coplanar parallel lines (in red). The lines in between the keys are straight, will never intersect, and are in the same plane. The keyboard was found on my laptop, and is used everyday by many because it is what helps you type on a laptop. Keyboards can be used by authors, students, teachers, etc. A keyboard falls under the category of information technology because many researchers use the technology of laptops and find data. I took this photo on my camera.