Making a 2 sided wedge shape I'm still very new to blender so sorry if this is a basic question, I'm trying to make like a 2 sided wedge, I'm not sure if that's what it's actually called though. I thought maybe I could do this with a cube and use a subdivision surface and then drag the edges down to make it slanted. To clarify what shape I mean, I will attempt to make one below

    _________________
   /                / \
  /                /   \
 /                /     \
/                /       \


Sorry about this very poor drawing/explanation, any help on this would be appreciated
Add a circle Shift+A

Reduce its verts down to 3 >> Enter

Tab to enter edit mode

F to fill the vertices with a face.

E to extrude to the length that you desire.