Generally drafting uses simple math, addition, subtraction, mulitplication, division, for calculating various dimensions. Math is also used for converting dimensions.
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The course work in drafting requires a great deal of knowledge in calculus, trigonometry and geometry. If you have a limited exposure to these fields, try to get some additional coursework in the areas of math.
math is used to show people the different ways math can be used such as fractions or decimals you name it
There are many types of symbols used in drafting. Diagonal lines, a.k.a. crosshatch, are used in orthographic views to show that the plane in which the current view lies, goes through a portion of the "part" being drafted.
In drafting with a T-square
yes they are used in many ways in math