# Video: Identifying the Type of Angle That the Line with the Positive Slope Makes with the Positive đť‘Ą-axis

If a line has a positive slope, what can be said of the angle it makes with the positive đť‘Ą-axis?

01:14

### Video Transcript

If a line has a positive slope, what can be said of the angle it makes with the positive đť‘Ą-axis?

A positive slope means the line is increasing from left to right. Now it canâ€™t tilt; it canâ€™t move. However, if the line goes directly vertical up and down, itâ€™s considered an undefined slope. Or, if it were horizontal, it would be zero slope.

So it has to be somewhere between the vertical line and the horizontal line. This means the angle that would be formed between the positive slope and the positive đť‘Ą-axis is that â€” it must be an acute angle. It must be less than ninety degrees. Because like we said, it has to be between the undefined slope and the zero slope. So it has to stay essentially with the ninety degrees. So it canâ€™t be exactly ninety degrees because that would be the up and down undefined slope, and it couldnâ€™t be zero degrees because thatâ€™s a zero slope.

So if we need a positive slope, then it needs to stay between those. So it must be an acute angle, which is between zero and ninety degrees.