Take three non-collinear points $A, B$and $C$ on a page of your notebook. Join $AB, BC$ and $CA$. What figure do you get? Also, name the side opposite to $\angle B$.
 

Take three non-collinear points $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ on a page of your notebook. Join $\mathrm{AB}, \mathrm{BC}$ and $\mathrm{CA}$. The figure so formed is a triangle. Name the vertex opposite to side $\mathrm{AB}$.

Take three non-collinear points $A,B$ and $C$ on a page of your notebook. Join $AB,BC$ and $CA$. Name the side opposite to vertex $B$.

In Figure, $\mathrm{D}$ is a point on side BC of a $△ABC$. $\mathrm{AD}$ is joined. Name all the triangles that you can observe in the figure. How many are they?

In the given figure, $A, B, C$ 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.