Question

In Fig. 12.12, A, B, C and D are four points, and no three points are collinear. AC and BC intersect at O. There are eight triangles that you can observe. Name all the triangles.

Answer 1

The following figure consists of triangles, namely ∆ODC, ∆ODA, ∆OBC, ∆OAB, ∆ADB, ∆ACB, ∆DAC and ∆DBC. Hence, there are a total of eight triangles.