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Details for problem "Angle bisector construction"

Quickname: 9432

Suitable for K-12 grades: Grade 5 Grade 6 Grade 7

Elementary School, Primary School, Junior High School, Middle School, High School.


Construct the bisector for a given angle using just a compass and a straightedge.


Construct the bisector for a given angle using just a compass and a straightedge. (Example for this math problem)


A drawing of an angle is given. The task is to do construct its bisector in with the classic straightedge and compass construction, also known as ruler-and-compass construction. The construction follows these steps:

  1. Two arcs are made on each ray of the angle with the same compass opening, which means the two points that are marked on the two rays of the angle have the same distance to the angle's vertex.
  2. From each of the marked points on the angle's rays swing an arc between the rays, making sure these arcs intersect at some point.
  3. Draw a line from the angle's vertex through the newly formed arc intersection. This line is the angle's bisector.

For an easier problem statement, in addition to the angle itself, other construction elements may be provided:

The angle's size can be chosen to be up to 90 degrees or up to 170 degrees. The size of the drawing can selected from multiple options. There will always be enough space left on the sheet to allow the full construction.

Topics: Geometry

Tags: Angle Classical Construction Drawing

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Customization options for this problem

Possible values
Number of problems
1, 2, 3, 4, 5
Size of drawing
4cm, 6cm, 8cm, 10cm, 12cm
Given elements
none, one arc on single ray, arcs on both rays, both arcs, one side, all arcs
Max size of angle
90, 170

Similar problems

Name and direct link
Angle bisectors in a triangle
Draw heights, medians, angle bisectors or perpendicular bisectors for a triangle.

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