जब कोई सतह प्रक्षेप के समतल (plane of projection) के समानांतर होती है, तो उसका प्रक्षेपित दृश्य कैसा दिखाई देता है?

In an isometric drawing projection, the angle between any two adjacent isometric axes is:

In technical engineering drawing, when the plan view (top view) is drawn directly below the front view, which type of orthographic projection system is being utilized?