Bisectors of Triangles, a Step by Step Guide to Solve Perpendicular Bisector Problems

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As you know already, the foundation of geometry is being able to determine key details from a small collection of data. A significant type of section, ray, or line that can enable us to show congruence is a bisector angle. It’s important to understand what angle bisectors are and how they impact triangle relationships as we proceed with our analysis of geometry. Let us explore various forms of bisectors and the corresponding terms that are important for understanding the subject.

What is bisector?

It is a term that is used for a line or ray bisect a triangle and cuts or divides the triangle or any geometrical shape into two equal parts or halves, that is called bisector of that particular shape. In other terms, the bisector at the midpoints of a side of the triangle will always converge.

What will be the perpendicular triangle bisector?

When we talk about a triangle, then a perpendicular bisector is a term that is a straight line (or arc, or segment) and it must be perpendicular to one side of the triangle to each side of the midpoint. If there are three or more lines that meet or converge at the one specific location, concurrent lines (or rays, or segments) are formed.

Thus, the point of concurrency is the point on which all the lines converge. It may vary where the point of interaction form, for example it may form within the triangle, on the triangle, or outside of the triangle.

The point at which the perpendicular bisectors in a triangle meet is called the triangle circumcenter. Or in other words, the three perpendicular bisectors of a triangle’s sides intersect at one point, the circumcenter. A point where three or more lines converge is dubbed a point of intersection.

The distance between the circumcenters is equal to the vertices of the triangle. The term circumcircle is defined as the circle that has a circumcenter along with the radius and it is equal to the distance that passes through all three vertices. Thus, it can be described as the smallest circle that the triangle can be enclosed in.

The circumcenter for the acute triangles falls within the triangle, on the hypotenuse for right triangles, and for obtuse triangles resides outside the triangle. If this is an isosceles right triangle, the circumcenter coincides with the hypotenuse midpoint.

Steps for finding perpendicular bisector

The perpendicular bisector can be easily derived by following this simple method:


First of all, all you need is to find out midpoint of the line and it is the most important step in finding perpendicular bisector. It can be obtaining by using the midpoint formula that is written as

[(x1 + x2)/2, (y1 + y2)/2].

Step 2

The next step is to find out the slop of the line using the slope formula that is written as

(y 2 – y1) / (x 2 – x1).

Step 3

The very next step is determining the slope of the perpendicular bisector as you already know that the slopes of perpendicular lines are obtained by taking the negative reciprocals of each line.

Step 4

The final and last step is deriving the perpendicular bisector equation that is the combination of the equation with the slope and the midpoints and its formula becomes y – y1 = m (x – x1) 

where y1 and x1 are represented asmidpoint coordinates.

Step 5

And you can see that finally by using the point-slope equation for y you can get y = mx + b

In this equation, x and y represents the coordinates of the respective line. And the “m” is for representing the slope of the line and the “b” shows the y-intercept of the line.

Another simple way is using an online Perpendicular bisector equation calculator by meracalculator to determine the bisector equation for the two given points. This online equation of perpendicular bisector calculator asks for ‘x’ and ‘y’ coordinates of the respective two points A and B that it takes as inputs to calculate outcomes within a fraction of seconds. It shows the outcome of the Perpendicular bisector equation in the form of y – k = m (x – h). Perpendicular bisector calculator by meracalculator measures the equation by determining the midpoints.

Bisector theorems

We use two essential theorems from perpendicular bisector characteristics. Thesetheorems in our geometric two-column proofs can be used for assistance in geometric calculations.

 These theorems are names as

1. Perpendicular Bisector Theorem

  • Angle bisector theorem

Perpendicular Bisector Theorem

If a point is located on a segment’s perpendicular bisector, it is equally distant from the segment’s endpoints. Converse Perpendicular Bisector Theorem is also true which states that when a point that is adjacent from the endpoints of a line, then that point is on the perpendicular bisector of the section.

Theorem circumcenter

The perpendicular bisectors of the sides of a triangle converge at a point called the circumcenter of the triangle that is equidistant from that of the triangle.

Angle Bisector theorem

Now, the second theorem is angle bisector theorem that is considered as an important geometric concept. It is especially important to assist you in finding as well as proving congruence between two angles. When we talk about what the angle bisector is, then it is any point, segment, ray, or line that cuts an angle into two equal congruent angles, called an angle bisector.

The angle bisector theorems are commonly used to derive important information from relatively simple geometric figures.

Angle Bisector Theorem

It is a point that resides on the bisector of an angle of the triangle, and it is adjacent from each side of the angle. It also has a converse theorem form that is a converse angle bisector theorem.

Converse angle bisector theorem is also consideredtrue which implies that if a point is within an angle, and adjacent from the points, it resides on the angle’s bisector. The incenter is the position where angle bisectors converge in a triangle.

Similar to a triangle’s perpendicular bisectors, there is one common point where a triangle’s angle bisectors cross.

Theorem for the Incenter

A bisector of a triangle converges at a point called triangle incenter that is equally distant from the triangle sides.


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