# Thread: Finding the slope of a line without coordinates or scale

1. ## Finding the slope of a line without coordinates or scale

I've been trying to figure these questions out for hours, and I'm sure it's probably something very simple...

Here is the diagram I am working from...

What is the slope of AB?
If the measure of angle A=30 degrees, what is the slope of AB?

2. Originally Posted by Kiki31
I've been trying to figure these questions out for hours, and I'm sure it's probably something very simple...

Here is the diagram I am working from...

What is the slope of AB?
If the measure of angle A=30 degrees, what is the slope of AB?
Slope is "rise over run" so the slope will be equal to a/b. Likewise you can use some simple trigonometry to prove that the slope is equal to $\displaystyle tan(\theta)$ where $\displaystyle \theta$ is angle A.

-Dan

3. Okay, that's what I thought the first answer would be. Thanks

Any idea about the second question?

4. Originally Posted by Kiki31
Okay, that's what I thought the first answer would be. Thanks

Any idea about the second question?
That's what the "tangent" comment was in reference to. The slope of the line is the tangent of angle A.

-Dan