SOLUTION TO TEST PROBLEM #2:

Area of triangle BOA= (1.9 x 3.3)½ =2.1 cm²

Area of triangle BOC= (6 x 0.7)½ = 2.1 cm²

Area of triangle AOC= (4.2 x 1.1)½ = 2.1 cm²

Point O is the centroid of triangle ABC because the centroid forms 3 triangles with the same areas.