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				| 1. | A line is in vertical plane and perpendicular to horizontal plane at a distance of 10 cm from horizontal plane and 5 cm from profile plane. What is the distance from vertical reference line to line?$ | 
| A. | 10 cm | 
| B. | 0 cm | 
| C. | 5 cm | 
| D. | 7.5 cm | 
| Answer» D. 7.5 cm | |