Angle between Two Lines

# Angle between Two Lines

The angle formed by two lines It is useful to understand the relationship between the two lines. This will be the angle of inclination between two lines. There are two angles formed by two intersecting lines: the acute angle and the obtuse angle. Once two straight lines intersect, two sets of angles are formed. The intersection generates two acute angles and two obtuse angles. The absolute values of the formed angles are determined by the slopes of the intersecting lines. We regard the acute angle between two lines when calculating the angle between them. We could use the angle formed by two lines to calculate the angle formed by two sides of a closed polygon.

Fill Out the Form for Expert Academic Guidance!

+91

Live ClassesBooksTest SeriesSelf Learning

Verify OTP Code (required)

It’s also worth noting that the angle formed by the intersection of two lines cannot be calculated if one of the lines is parallel to the y-axis because the slope of a line parallel to the y-axis is indeterminate.

## Angle Between Two Straight Lines Formula

If θ is an angle formed by two intersecting lines defined by y1= m1x1+c1 and y2= m2x2+c2,, the angle will be:

tanθ = ±(m2-m1) / (1+m1m2)

### Angle Between Two Straight Lines Derivation

Lines L1 and line L2 intersect at a point in the figure above.

Now, the slope measurement is quite as follows:

tan a1 = m1 and tan a2 = m2

Then, from the figure, we can infer that θ = a2-a1

So, tan θ = tan (a2-a1) = (tan a2 – tan a1 ) / (1- tan a1tan a2)

When substituting the values of tan a1 and tan a2 as m1 and m2 respectively, we have,

tanθ= (m2 – m1) / (1+m1m2)

It must be observed that in this equation, the value of tanθ will be positive if θ is acute and negative if θ is obtuse.

### Angle Between Two Lines Coordinate Geometry

If indeed the coordinates of three points A, B, and C are given in analytic geometry, the angle between the lines AB and BC can be calculated as follows:

The slope of a line with endpoints (x1, y1) and (x2, y2) is given by the equation:

Whenever the slope of each line is known from the equation, the angle between the two lines can be calculated by calculating the slope of each line and then using it in the formula to determine the angle between two lines.

tan θ=± (m1 – m2) / (1+ m1m2)

## FAQs

##### How to find the angle between the two lines with regards to a triangle?

First and foremost, the cosine rule must be applied. The values for the sides b, c, and angle A must then be entered. Following that, one must solve for side a. The angle value must then be used in conjunction with the sine rule to deal with angle B. At last, angle C can be found by remembering that the angles of all triangles add up to 180 degrees.

##### What is the angle between two perpendicular lines?

The angle formed by two perpendicular lines has always been 90°. This one is referred to as the right angle. The property of being perpendicular refers to the relationship that exists between two lines that meet at a right angle (90 degrees).

## Related content

 Who Will Conduct NEET? NTA or NMC Start your IIT JEE & NEET Preparation Today with INFINITY LEARN Classes – Lucknow The Right Way of Practicing and Preparing for IIT JEE 7 Colors of Rainbow and the Fascinating Science Behind Them Easy and Fun Physical Exercises for Active Kids CBSE Class 10 Science Syllabus for Board Exam How to prepare for Olympiad exam in Class 10? How to Prepare for the Science Olympiad? Mark Your Calendars for the JEE Mains Session 2 Admit Card Release 2024 List of Top 25 Engineering Colleges Based on JEE Main 2024 Result In India

+91

Live ClassesBooksTest SeriesSelf Learning

Verify OTP Code (required)