Find the circumcentre of the triangle with the vertices A -LRB- -3,4 -RRB- , B -LRB- 3,4 -RRB- and C -LRB- -4 , -3 -RRB- . What is the circumradius and area of the circle ?
How can one find the area of a triangle ABC whose vertices are A -LRB- 4,4 -RRB- , B -LRB- 0,0 -RRB- , and C -LRB- 6,2 -RRB- ?