Make a triangle with exact dimensions In other 3d modeling software I've used, it is very easy to create shapes with specific dimensions. 

Here is a wedge with angles of 30 (at the smallest angle) 60 (at the middle sized angle) and 90 degrees, drawn in sketchup. 



How would I model the same thing in blender? I can deform a cube to be a wedge, but the angle is not exactly 60 degrees
Create an arbitrary triangle:

Enable vertex Snap mode

Set the pivot point to 3D Cursor

Snap the 3D Cursor to one of the vertices ( I have choosen vertex (a) in the image below):


Select Vertex (c) and snap it to vertex (b)

R 60



Now the angle at vertex (a) has exactly 60°