If the biggest angle of the triangle is obtuse (more than 90 degrees), the bisectors will cross at a position beyond the triangle's perimeter. If the triangle is a right triangle, the bisectors will cross on the hypotenuse (at **the same point** that its bisector crosses it). If not, they won't meet there.

If the biggest angle is acute (less than 90 degrees), the bisectors will cross at a position inside the triangle. If the triangle is a right triangle, the bisectors will cross on the leg opposite the acute angle (at the same point that its bisector crosses it).

- For what kind of triangle do the perpendicular bisectors intersect at a point outside the triangle?
- What angle measure is always formed with a perpendicular bisector?
- Does an angle bisector create similar triangles?
- In a triangle, what is perpendicular?
- Do perpendicular bisectors always include a vertex?
- What is an angle bisector in geometry?
- Do perpendicular bisectors form right angles?
- What is a segment through the midpoint of a side of a triangle perpendicular to that side?

A perpendicular bisector always crosses the line segment at **right angles** (90 deg).

A triangle's angle bisector divides the opposing side into two segments that are proportionate to the triangle's other two sides. To make triangles that are comparable An angle bisector is a ray that forms two congruent angles in the interior of an angle. This means that the ratio of the angle bisector's length to the opposite angle's length is the same as the ratio of the adjacent angles.

In practice, this means that if you know one of the angles of a triangle, you can find the other two using simple math. For example, if you know that one of the angles of a triangle is 90 degrees, then the other two will be 45 degrees each. You can use **this fact** to determine the type of triangle that you have. If you also know that one of the legs is longer than the other, then the triangle is not right-angled and it is not equilateral either. The only right-angled triangles that satisfy this condition are those with **equal legs** (45-45-90 or 30-60-90). Equilateral triangles have **three equal legs**; therefore, they cannot be determined from just one angle.

Finally, if you know that one of the angles is less than 90 degrees, then the triangle is not rectangular and it does not contain the largest possible angle. The remaining two angles are greater than 90 degrees.

A perpendicular bisector of a triangle side is a line that is perpendicular to the side and passes through its midpoint. The circumcenter is the point at where the three perpendicular bisectors of a triangle's sides meet. A point of concurrency is defined as the intersection of three or more lines. Each pair of lines contains one point of concurrence: the circumcenters of the two triangles.

Concordant pairs of angles are pairs of angles that have **the same measure** in degrees. In **other words**, if two angles in a triangle are equal, then the third angle also has to be equal. If two angles in a triangle are complementary, then the third angle is equal to **180 degrees** - the sum of the other two angles. Concordance is very important in understanding and solving for the variables in a problem involving triangles; there are several ways to determine if two angles are concordant.

In order to solve for the variable in a problem involving triangles, you must first determine if the angles are concordant or not. There are several methods used for this purpose. One simple method is to see if both angles can be paired off with another angle that is opposite it (i.e., 180 degrees- apart).

A perpendicular bisector always, if not always, has a vertex as an endpoint. Angle bisectors of a triangle never, if ever, intersect at a single point. An altitude can also be a perpendicular bisector. All perpendicular bisectors are parallel to the opposite angle sides of the triangle.

The line or line segment that splits an angle into two equal pieces is known as **the (interior) bisector** of an angle (Kimberling 1998, pp. 11-12). At the incenter, the angle bisectors meet. Each angle bisector divides **the corresponding angle** into two identical parts.

Angle bisectors are important for determining the angles inside a triangle. If we know three angles of a triangle, we can find the remaining angle using angle bisectors. The four lines that are angle bisectors of a triangle intersect at a point called the center of curvature of the triangle. From there it is easy to see why these lines are important for finding the lengths of sides of the triangle: they divide the triangle into two identical parts. Also, note that if one of the angle bisectors is fixed, then the other two will form a straight line. The angle bisector theorem states that any angle in a plane contains a line that is perpendicular to the opposite side of the angle.

Angle bisectors are also important in geometry because they allow us to find the measure of a missing angle. If we know the angle measures of two angles of a triangle and want to find the third angle's measure, we can use the angle bisector theorem to help us. We can choose any angle bisector and draw lines from **the interior angles** to this chosen angle bisector.

Perpendicular Bisector Properties It separates or bisects AB into two equal parts. It is perpendicular to (or forms a right angle with) AB. Every point in the perpendicular bisector is equidistant between points A and B. The perpendicular bisector is always defined for any pair of points that can be joined by a line.

A triangle's perpendicular bisectors are lines that travel through the midpoints of each side and are perpendicular to **the given side**. Because these lines always pass through the middle of some angle, they are also called central angles. A segment is any part of a line that lies between **two points**; thus, a segment is the distance between two points. The word "segment" can also be used as a synonym for "branch." If we imagine removing a branch from a tree, then the segment removed would be the part of the branch that connects it to the rest of the tree.

Triangles are the most common polygon after circles. There are many ways to divide triangles into smaller pieces. One way is to break them down into their constituent parts: triangles have three sides and three angles. Another way is to split them into their maximum possible number of equal parts. A third way is to divide them through their medians, which are parallel to and go through the middle of the line connecting the opposite vertices. A fourth way is to divide them along their orthogonal diameters, which are parallel to and go through the center of the circle that each triangle forms.