Question

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

Answer 1

The eight triangles that can be observed in the given figure are as follows:
$$\begin{gathered} 1.△\mathrm{AOD} \\ 2.△\mathrm{AOB} \\ 3.△\mathrm{BOC} \\ 4.△\mathrm{COD} \\ 5.△\mathrm{ACD} \\ 6.△\mathrm{ACB} \\ 7.△\mathrm{ADB} \\ 8.△\mathrm{CDB} \end{gathered}$$