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SCIENTIFIC METHOD
Lesson 5 - Page 2

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There are three basic triangles when classifying by angles including acute, right, and obtuse. An acute triangle has three acute angles (three angles that are less than 90 degrees.) If one of the angles in a triangle is a right angle, then the triangle is called a right triangle.  An obtuse triangle has one angle that is greater than 90 degrees.

There are many examples in homes were non moving triangles are used including braces on chairs or walls. Even flushing the toilet has its underlying mechanism as a triangle.  If you are playing basketball, many times the hoop is being reinforced by the structure of a triangle.  An ironing board can be adjusted depending on the height of person by making the angle change by moving the bar. 

Understanding the properties of triangles is included in traditional geometry and trigonometry.  Engineers understand this relationship when they design structures that need to be reinforced.