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**david_d****Guest**

is there a way to calculate the angle of a line in a grid based system?

**Patrick****Real Member**- Registered: 2006-02-24
- Posts: 1,005

I think trig is the tool you'll be needing here... This is, however, not a branch of mathematics I'm very familiar with.

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**david_d****Guest**

ok appraently u take the arc tangent of the slope to calculat the angle does any 1 know how to calculate the arc tangent?

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,935

david_d,

If the equation of the straight line is

ax+by+c=0, then the slope is given by the formula

But the slope of the line is tan of the angle made with the x-axis.

Therefore,

The angle is the arctan of the slope m.

The arctan can be known by referring to tables or by using a calculator (scientific mode).

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**david_d****Guest**

thanks alot

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