From school to roads to concrete to food there are all types of grades. Now you can buy an app called Fooducate to help you make the right choices in the grocery store. It grades the food from A-D based on the information on the nutrition facts. It takes the nutrients, ingredients, processing and fortification into consideration and gives the food a grade. Get this app and EAT HEALTHIER today!
An angle of repose is the highest slope a pile of loose material can stand without sliding. In physics it is "the angle that the plane of contact between two bodies makes with the horizontal when the upper body is just on the point of sliding: the angle whose tangent is the coefficient of friction between the two bodies." (http://www.merriam-webster.com/dictionary/angle%20of%20repose)
Railroad grades, or ruling gradients, is basically the "steepest climb between two points on a railroad." (http://en.wikipedia.org/wiki/Ruling_gradient).
(url)![](http://upload.wikimedia.org/wikipedia/en/thumb/f/f6/Cascade_Tunnel_1_as_built.svg/489px-Cascade_Tunnel_1_as_built.svg.png)
![](http://upload.wikimedia.org/wikipedia/en/thumb/f/f6/Cascade_Tunnel_1_as_built.svg/489px-Cascade_Tunnel_1_as_built.svg.png)
On our homework you work with the sine, cosine and tangent.
(
adjacent-opposite-hypotenuse.gif)![triangle showing Opposite, Adjacent and Hypotenuse](http://www.mathsisfun.com/images/adjacent-opposite-hypotenuse.gif)