# How to find the slope?

1. Dec 8, 2003

### to_kool2003

how to find the slope???

ok, I'm really confused with this Question: "Whats the slope of a 0 degree angle, and if so how did u do it or how can u prove it. I need a reply because it is urgent. thx for replying

2. Dec 8, 2003

### gnome

Uh, what's the slope of any angle?

A line has a slope. An angle doesn't. You'll have to get the question straight before you have any hope of answering it.

3. Dec 8, 2003

### StephenPrivitera

That sounds like nonsense to me. The slope of an angle?

4. Dec 8, 2003

### to_kool2003

i meant when u graph the angle in a coordianate plane the angle has a rise and run so there should be a slope

5. Dec 8, 2003

### himanshu121

If You plot the graph with certain coordinates then

slope $$\tan\Theta=\frac{\Delta(y)}{\Delta(x)}$$

Last edited: Dec 8, 2003
6. Dec 8, 2003

### StephenPrivitera

Ah a line which makes an angle A with a horizontal line has slope tanA.

7. Dec 8, 2003

### to_kool2003

what do u mean tanA, Im asking for ppl to show me how to get the slope of a 0 degree angle, and u could graph an angle in a coordianate plane so there must be a run and rise, u could get the slope......................... I do think there's a solution

8. Dec 8, 2003

### himanshu121

What is A for Zero degree, it is zero so u know calculate this prob.

9. Dec 8, 2003

### to_kool2003

huh?
[?]

10. Dec 8, 2003

### gnome

If you're talking about a line that makes an angle
$$\theta = 0 ~degrees$$ with the x-axis, the
$$slope = \frac{\Delta y}{\Delta x} = tan~\theta = 0$$

To put it in your terms, the rise is 0, so the slope is 0.

But remember, that is the slope of the line, not the angle.

11. Dec 8, 2003

### to_kool2003

ok......... That answer part of my question but I still think something is missing[?]

12. Dec 8, 2003

### StephenPrivitera

out of curiosity, where did you find this question?

13. Dec 8, 2003

### himanshu121

i wonder what after the reply of gnome is missing

14. Dec 9, 2003

### HallsofIvy

Staff Emeritus
Did you ever actually draw such a line??

A line with 0 angle is horizontal. All points that it passes through will have the same y component. What do you think the "rise" is??

15. Dec 9, 2003

### to_kool2003

ok I go the answer and gnome was right, thx

16. Dec 10, 2003

### HallsofIvy

Staff Emeritus
Since you have the answer now:

In general the slope of any straight line making angle &theta; with the x-axis is tan(&theta;). Of course, tan(0)= 0.