Hello,
“surfaces” you mean planes? Angle between planes is the same as angle between their normals. Look ad the picture . There is intersection line and on the left you can se V shape and on the left A shape.
Hello,
“surfaces” you mean planes? Angle between planes is the same as angle between their normals. Look ad the picture . There is intersection line and on the left you can se V shape and on the left A shape.