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Copying a Line Segment
Constructing a 30° Angle
Constructing a 60° Angle
Finding the Center of a Circle
Constructing Circumcenter of a Triangle
Constructing an Equilateral Triangle
Constructing a Perpendicular Bisector of a Line Segment
Constructing a Perpendicular at the Endpoint of a Ray
Constructing Tangents Through an External Point

Constructing Circumcenter of a Triangle

(This demonstration shows how to construct the circumcenter of a triangle using only a compass and straightedge)

Step by Step Instructions
  1. Find the bisector of one of the triangle sides. (Firstly, you can examine the "Constructing the Perpendicular Bisector of a Line Segment" part.)
  2. Repeat the same drawing for the another side.
  3. Mark the point where these two perpendiculars intersect as point O.
  4. Done. The point O is the circumcenter of the triangle (ABC).
  5. Note: This point may lie outside the triangle. This is normal.

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