vertices,faces and edges

In maths I have been learning how to do vertices,faces and edges I am now going to give you 3 examples.

 If you got the bottom one you are right because a vertice are the edges that hold the sharp together...

 Kinda the same question but all you do is just count the edges together so if you got 6 you are right...

 This is a different one to the last time so the edges are the stight lanes so if you got the bottom one you are right...

I am at extended abstract because I can explain how to do the strategy.

Thank you for reading my maths goal😀