Construction #10
Circumscribe a circle about a triangle
To see a video of Mr. Ochs doing examples
Mr Ochs Video To see and example done in flash click on a link below Math Open Ref Math is Fun 

Given a triangle, circumscribe a circle about the triangle.
Construct the circumscribed circle about triangle ABC.
1) Construct the perpendicular bisectors of two sides of the triangle and extend them to intersect each other.
2) Take the compass and place the pointer on the point of intersection in #1, then set the radius equal to the distance to any one of the 3 vertices of the triangle.
3) With this new radius draw a circle about the triangle. (it should pass through all 3 vertices of the triangle)
Construct the circumscribed circle about triangle ABC.
1) Construct the perpendicular bisectors of two sides of the triangle and extend them to intersect each other.
2) Take the compass and place the pointer on the point of intersection in #1, then set the radius equal to the distance to any one of the 3 vertices of the triangle.
3) With this new radius draw a circle about the triangle. (it should pass through all 3 vertices of the triangle)