Find its inclination with VP. Take B in first quadrant.
The distance between the end projectors of line is 40mm. A is 15mm above HP and 20cm in front of VP. The line is inclined at $30^0$ to HP. Draw the projections if the true length of the line is 80mm.
The Inclination of Line with VP is measured as 45°
After step 7 i.e. drawing Locus of b, you can either mark TL by taking 80mm on compass and marking 80cm from a on Locus or use FV to locate b1. I have used the second method above.
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