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Which one of the following is an AutoCAD relative polar co-ordinate

(b) @81,30
(c) 30<81
(d) @81<30

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To continue drawing a line from the last known point, enter	ou are designing a floor plan and know the length and angle of one of the wall segments to be 1500mm and 30 degrees. This is to be followed by a wall 2000mm long at 90 degrees to the first. Which one of the following is the correct input?